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There are no plans to alter Centaurs or Trolls. The Centaurs are a real problem from a playable point of view. They are all cavalry, so you cannot storm a settlement, you would always have to starve them out, plus if you had any other none centaur unit in with the army and that unit became a captains unit in battle, well it would look really bad as you would get the centaur captain model.
Besides I use both factions for scripting when the player is using one of the southern kingdoms, just to keep them on there toes.
Over the last week I've added over 100 character portraits and have been working on some of the names, the Dwarves for example have all been renamed. I've tidied up a lot of the other text as well and started on the quotes. The one thing that is really holding me back is the completion of the custom settlement for the Elves that I started on. (The Elves now have there own custom culture, before they were the only 'Greek' culture, which defaults heavily to SE)
So there won't be anything new uploaded for a while until its done. But when the new stuff is ready you can expect in addition to the above, some slight map tweaks and some unit balances as well as a load of UI and text stuff. Probably mostly real subtle stuff, hence I feel the Elven Village needs to be included.