India definitely needs to be fixed; as someone pointed out above, their ability was almost overpowered in Vanilla, but in G&K it's usually more of a hinderance than a help. If they want to go the "population growth" theme they should just get a straight-up bonus to population growth. Frankly though something to do with religion would make a lot more sense being that many of the religions available to found in Civ V were founded in India (Buddhism, Hinduism, Sikhism).
Also if any Civ is in need of a fix it's America. Their UA is without a doubt the least useful. Sure it's sometimes nice to know what units your opponent has hidden in that fog of war, but basically any other UA would be better. (And tile-buying? Are you kidding me?) Something to do with culture would make more sense given how America spread its culture around the globe in the 20th century.
Arabia will probably be changed.
We know so little about how culture is going to be changed that it's hard to say if they'll have to change France, Aztecs, etc.
One thing I hope they do is fix Austria a bit. I don't mind their UA, but I don't think they should be able to PERMANENTLY remove a city-state from play; that just seems broken to me. No other civ can do this, not even by conquest (can't raze city-states). I don't think they really thought through how completely this mechanic screws up diplomatic victories. At the very least, when you conquer a former-city state which has diplo-married into Austria, you should have the option of liberating that city-state! IMO, they should give all civs the ability to diplo-marry along these lines, but give Austria a significant bonus to this ability (eg: it costs other civs 2 or 3x as much gold to diplo-marry or something).