Now just remember these are just ideas, most will probably never be seen and some have already been mentioned. I just wanted to give ideas for the TATW team and perhaps even submodders... so here I go.
OotMM:
Boldog: Extremely powerful goblins possessed by a Maiar. (Extremely small unit pools, more powerful than any other orc unit and unroutable)
Balrog: Creature of flame and fire twice the height of a man. (Now the movie actually doesn't depict them accurately and the books description isn't quite as impossible to make. It's just a huge human like figure wreathed in shadow and flame.. the shadow and flame part could be shown just by a cool texture.)
Wargs: Intelligent wolf creatures that are friends to the goblins
Greater Goblin: It is possible that the greater goblins were actually Boldogs, but they could be shown as a separate entity.
Hobgoblins: Hobgoblins are most likely Greater Goblins, still for the sake of exactitude I felt obligated to place them.
Stone Trolls: Primitive trolls without armor or weaponry, they are however among the largest of trolls though they turn to stone in the sun. (Obviously they won't be able to turn to stone so like 30 heat value instead.)
Hill Trolls: Smaller trolls wielding a large buckler and hammer.
Goblin Billorc: Using cruel bills these goblins are trained to bring down tall enemies so they can be easily taken down.
Isengard:
Half-Orc Axeman: Powerful orcs bred from both man and goblin and well able to tear through most formations.
Dunland Axeman: Strong and ruthless axemen.
Dunland Archers: Lightly equipped hunters who are sent to war with little training and a sorry excuse for a bow of war, still, they are familiar with the bow.
Dunland Clan Lords: Equipped with powerful two handed swords, these men are devastating shock troops.
Orthanc Gaurd: Unwilling to trust his orcs with any large responsibility he has armed the most elite men of Dunland and dissafected Eorlingas with heavy plate and swords and shields of great quality. (Only 1 unit at a time)
Uruk-Hai Warriors: The most powerful of the Uruk-Hai, equipped with both bow, sword and shield and armored in light plates, they were bred to hunt down the ringbearer and other enemies of Saruman.
Ruffian: Scoundrels and bandits from the North, these men aren't much to look at but make up for it with their love of death and destruction. Armed with crude clubs and cudgels they are best employed for meat shield duty.
Uruk-Hai Sappers: Carrying destructive bombs these Uruk-Hai suicide charge into enemy fortifications and ignite their bomb to take out any structure in their path.\
Uruk-Hai Grenadiers: Wielding bombs much like the sappers but much smaller in size these Uruk-Hai throw a volley into the enemies ranks before charging at the demoralized remnants.
Dunlending Cavalry: While the men of Dunland are not horse people like the Rohirrim, their long wars with said people have led them to understand the importance of having a cavalry force.
Mordor:
Nurnen Conscript: Lightly equipped slaves sent to fight and die for their Lord Sauron.
Werewolves: Dark creatures from Dol Guldur they fight with a ferociousness and grace that shows they are no true wolf.
Nurnen Taskmaster: The luckier men of Nurn who are chosen to keep the other slaves at work, they are slightly more heavily equipped and have some training.
Wraith: Minions of Sauron like the Nine, but far less powerful. They are deadly but vulnerable and are best used as ambushers.
Orcs of the Red Eye: Superior orcs equipped in gear bearing the Red Eye of Sauron.
Orcs of Minas Morgul: A proud army of orcs arrayed in gear bearing crescents and moons of the tower of the moon.
Greater Orcs: While not of the newer breed of Uruks some of the orcs of the mountains surrounding Mordor have grown larger through natural evolution, they are as strong as Uruks but without their discipline or intelligence.
Harad:
"Troll" men of Far Harad: Tall and powerful men who are so large that some mistake them to be part troll, they are well able to take on any opponent with a fair chance of success.
Wildmen of Harad: Men who live in the deep jungles in the far expanses of the south, they are lightly equipped but will fight like mad men for the Dark Lord.
Dark Numenorian: Dark Numenorians who stayed in Umbar and now rule over the corsairs and have for all intents and purposes, become one of them. Their blood is much less pure than those of Mordor and therefore they are much less skilled in combat, however they are still a force to be feared.
Rhun:
Rhunnic Swordsmaster: Rhunnic lords wielding large sabers of excellent craft, these men are among the greatest and most refined of human sword wielders upon Middle-Earth.
High Elves:
Gondolindrim: Remnants of the elves from Gondolin, they bear large hammers and are a force to be reckoned with.
Havens Shipwright: Elven marines equipped with a sword and shield and light mail.
Elven Lord: Great Elvish lords who have seen the light of the trees and are half in Middle Earth and half in the land of the Vala. There are few left west of the great seas but those who remain are truly terrible upon the field of battle.
Silvan Elves:
Silvan Axeelf: Wielding powerful one handed axes of beautiful forgery these elves are able to pierce any armor.
Silvan Axelord: Carrying great and terrible two handed axes of the very best craft these great Silvan lords are said to be able to take down even trolls in a single stroke.
Lothlorien Wardens: Wardens of the sacred elven glades, they are cloaked in a gray cloak of excellent Elven craft, they also wield a fine bow.
Dwarves:
Dwarven Archers: Dwarves are hardly the best marksmen, but they are still well able to pull a bow string.
Dwarven Crossbowmen: The standard crossbowmen and ranged unit of Dwarven forces.
Khazad Guard: Extremely heavily armored guards of Khazad-Dum, they wield a mattock and are extremely experienced and powerful warriors.
Dwarven Pathfinder: Dwarves who have taken to wandering about Middle-Earth only equipped with a leather tunic and leggings with some light mail covering the chest and a small axe.
Dwarven Cavalry: Riding their great war steeds (little ponies) they go into battle hacking and slashing at all in their path (friend and foe alike as they go completely out of control and writhe around in their saddles).
Blue Mountains Clansdwarf: Wielding formidable mattocks these are truly a force to be reckoned with.
Dwarves of the Iron-Hills: Dwarves wielding heavy mattocks covered in a long chain mail vest.
Gondor:
Lamedon Levy: Men sent to war to fight the Dark Lord and other forces that might encroach upon their lands. They are equipped with short spears and should not expect to maintain a line.
Lamedon Infantry: Equipped with a cruel bill, these men can do great damage against their foes, but are vulnerable in a prolonged melee.
Blackroot Vale Archers: Elite archers who live upon the Blackroot river, these men are a match for any marksmen and can eliminate enemies with ease.
Belfalas Mariner: Light infantry in lamellar leather and equipped with light swords and small shields, they should not be expected to fight an enemy of any skill but are well suited to chasing down routers due to their light equipment.
Baygaurd of Belfalas: Professional troops who make sure no corsairs or other amphibious assaults are allowed to take place.
Ethir Fisherfolk: Wearing leather armor and equipped with short swords the men of the river are not very much suited for war.
Anfalas Huntsmen: Lightly equipped archers ill suited for war.
Anfalas Fishermen: Lightly equipped infantry ill suited for war.
Warrior of Pinath Gelin: Equipped in heavy mail over which they wear a green cloak, they bear long one handed swords and round shields.
Dol Amroth Man at Arms: Professional soldiers that march under the banner of Dol Amroth.
Rohan:
Meduseld Warrior: Warrior of the kings own halls, these men are a force to be reckoned with.
Eriador:
Bounder: Hobbits equipped in light mail bearing a short spear and small buckler.
Took Warriors: Tooks are among the bravest and largest of hobbits, these hobbits wield hunting bows and swords with more skill than the average hobbit.
Shirrifs: Shirrifs of the Shire, equipped in brightly coloured clothes with a feathered hat and wooden stick, these Hobbits aren't much good for fighting but can be a good force to leave in a town while your main forces are abroad.
Dale:
No clue for now, if you have any good ideas PM me.
Miscellaneous:
Giant Spiders: Giant spiders who roam the dark forests of the land, they are dangerous to small bands but prove to be only a nuisance to an organized force.
Wild-Men (or "wose"): Short, barrel chested men of the forests, these men are often thought to have mystical powers of one sort or another. While they have no allegiance to man they still prefer them over the cruel orcs of Mordor whom are their greatest enemy.
Hill Giants: Not sure what to say, I frankly think it was just the hobbits imagination...
These are, like I said, just ideas. Not even suggestions really, so devs don't take this as a pressure to make them.
If you can think of any for the factions I have yet to make lists for feel free to post some.
>>>>UPDATED 09/11/09<<<<< More to come soon... Ideas for any faction are welcome at this point.