11 bit studios announces an April 8 release date for the Windows and OS X editions of Anomaly Warzone Earth, their action/strategy game that reverses the tower defense genre by putting the player in the role of the attacker (tower offense?). The news is accompanied by some new screenshots, and here's an outline of the game:

The game tasks you with saving a near-future Earth from an alien onslaught. The invaders have captured the world’s major cities, building huge turrets that destroy everything in their path. It’s up to you to lead an armor squad through the streets of cities like Baghdad and Tokyo, planning the route and strategically choosing which units to deploy in order to crush the opposition. Take control of the Commander, whose special abilities and quick thinking will be vital in supporting the squad in its mission, as you engage in fast-paced, tactical battle across story campaign and two heart-pounding Squad Assault Modes.