It's not an AI at all. It's an API. and AI is artificial intelegence. this is used for things like mobs and/or opponents. An API however, is an Application Programming Interface, meaning an ingame GUI for installing mods, updating them, and things like that.
While I do hope that there will be an "in-game GUI for installing mods" along with some other things Mojang might do to help support the modding community, that is not what an API actually accomplishes.
The purpose of the API is to provide a consistent set of "interfaces" between the Mod and some piece of software you are use that allows multiple groups of programmers a way to communicate with each other. The operating system on your computer is an example of a kind of API. For example, Microsoft Windows uses an API called Win32API (and something comparable for 64 bit programming) that has been in place for nearly two decades and how almost all current Microsoft Windows applications are written.
From the user side, however, the current plan for mods suggest that there might even be something like an app store where you can "purchase" or at least obtain some mods to put into the game that have gone through some sort of review process. Rather than going to random locations or digging through forums to find some cool mods, there is going to be a central place to find well made mods and perhaps even a way to "donate" to the mod development. If you have to pay $1 for a good mod, I think it might be worth the effort... and it will help support the modding community in a big way as well.
just get modloader from risugami to be in the vanilla (with a few edits of course)... that would solve a lot of problems. the other part of the mod api that they need is the 4096 block update. CANT WAIT FOR THAT ONE.
Private Mod Note
Rollback Post to RevisionRollBack
Freakin' useful mod (I only use it for SSP!)
I like to play FTB with some additions. Also custom modsets are awesome!