no, i dont think so, even if you have teams unlocked, AI's wont ally or not with each other.
i have noticed this and i dont like it, AI's should be able to ally... though i dont know how Ironclad would code it, but if they could it would be nice... i mean, it'd be great to forge a 3 way alliance half way through the game and take on all comers... but you cant do that if your 2 allies are at each others throats, telling you to betray the other
basically, even if you have unlocked teams, you can safely assume that AI alignment will stay as it was when you started the game... that is, if you set AI 1 and AI 2 on the same team, they will always be on the same team, no matter what, and if you set AI 3 and AI 4 on opposing teams, they will always be on opposing teams