One of the statements made between 1.23 and Alpha was that 2.0 would be launching with a unique AI system, one that reacted to what the players were doing, the party setups, and its damage intake. It would react by using specific TP moves, perhaps if your group had poor AoE healing, it would use more AoE, that type of thing.
I'm pretty sure they scrapped it in favor of making the fights piss easy and instead of AI, made all the bosses toss a random attack at a random person randomly.
Look forward to it.