more news/confirmations
-AA3 coming to Steam
-upgrade to the Unreal Engine 3
-new training missions
-unlockable content
-improved ballistics system
-evamped audio system
-kill messages removed
-achievements
-Battle Planner
-new story/enemy
-jumping removed
-and more ...
Game Developers Conference 2009 - America's Army 3 Preview | ausgamers.com
The use of Steam is a surprise, at least to me.