From a devs reply on the AA forums:

The Overmatch release will only have AI for co-op game play and possibly new training levels . The AI we're currently working on is very far from what comes with the Unreal SDK. It also focuses on AI as a coordinated military unit, rather than the individual bot level. We're been pretty ambitious with our end goals and are not creating just another set of elablorate scripts like the kind that have become so popular with FPS games lately.

We won't be stopping there... the plan is to continue rolling in new technology, increasing the functionality of core systems, and to expand the game play (including the single player experience.) One of our core development goals has been to jump to the next level of technology rather than following the crowd.

James S. Cowgill ([Dev]nXain)
Lead Game Designer, AAGA
America's Army Project