Two currently - the 'indo-greek hoplite' of which there are two skins (one merc and one baktrian); and the indian longbow unit, which has swords also.

Can't remember if there's an indian light horse unit in the works or not.

Doubtful if there will be a faction though, as the only one that would work is only partially on our map and we're determined not to try to represent only part of a people on our map.