https://www.facebook.com/civ/videos/vb.117631940358/10154143011620359/?type=2&theater Ed mentioned that there will be a UU and a UI/UB (or even unique district) attached to each civilization. And there will be two other unique bonuses attatched to the leader. For example, Rough Ride is attached to Teddy, while P51 and Film Studio to US. The ability of builder + 1 charge and being able to rush wonders is era-limited (Ancient and Classical only), therefore it is attached to Qin, not China. The real UA of US and China are yet to be announced.