actually at first the forgotten civs were pretty under powered (or atleast considered to be, the only players who tried to find a meata that we had on HD before Rise of Rajas was Spirit of the law and a Tatoh playing vs people 100 elo lower than him) so that may be why they made sure that the afrikan kingdoms civs would be strong at launch.According to forgotten works new civs would be like:
Inuits complete tec tree, don't need to advance to next ages. UU a red skin archer with 30 pierce armor
Lithuanians infantry civ infantry line get extra 5 attack per age, creating monks cost wood.
Polish, free university upgrades, villagers work 40% faster
Swish ,every resource they gather gives them 1 extra gold, UU artillery unit that shoots 3 bullets (25 damage per shoot)
Zimbabwe, villagers get +40 HP, UU lion warriors faster than cavalry with 50 attack 25 hp cost no gold.