A combination of
Finite state machine with Schedule like system which are "AI Triggers" that can be executed with an OnThink concept. As well what you call "AI Hooks" are an extension to make new AI adding and Logics more easier to manage. As well higher level of Logics. Basically AI Types will no longer exists, as all AI will be done based on the creature's skills... There are four different AI Logic Levels. Of course I am not going to go into to much detail about this as in the future the entire system will be explained...
AI System will include a "Creature Special Abilities" that will allow faster Special Abilities to be added like Gas Attacks, Acid Spit, Area Damage, etc. all done with AI Triggers... The AI will open doors to even more advance AI logics which will be ported towards Custom Releases which I will provide more realistic AI.