Ostrogoths - "Survivors" - They still have their existing traits, but instead of having zero Public Order penalties after occupying Roman regions, the penalty is simply reduced by 50%. In addition, they have +10 morale against Nomadic tribes.
Franks - "Regnum Francorum" - Franks no longer have increased melee damage from taking casualties, but now they have a bonus to public order for each war with a neighboring faction and can recruit Roman units from Roman buildings.
Vandals - Vandals no longer have that line about superior naval units... which I don't think actually does anything. Can anyone correct me on that? But they now have that Ostrogoth reduction in conquest penalty for Roman cities, as well as a bonus to income from maritime commerce.
Danes - Danes still have their existing immunity to seasickness, but now also have "superior naval units" (again, not sure that actually does anything besides flavor), as well as a small diplomatic bonus with all factions and 10% increased wealth from maritime commerce to represent their trade and early contacts with other cultures over the sea.
Geats - Geats still have their +10 Morale bonus in Winter, but now also have +15 food in regions with poor fertility (Burgundian faction trait).
Alans - Alans still have their bonus to cavalry experience gain rate, but now also have a 10% reduction in cavalry fatigue rate. Maybe I'll add back in their growth bonus from being in the "Great Migrators" faction group. I just wish they had
a better roster to use all their cavalry traits with...
Caledonians - Caledonians no longer have a bonus to agent success chance. I probably need to add something else to replace this.
Huns - The existing "conquest" bonus to growth from razing has been moved to "death." To replace that, they now have a "conquest" bonus income from the formation of tributary states (Visigoth trait). The "death" trait that stopped foreign replenishment is gone entirely.