April 1st. If only they went with the rest of the news:

"Coming out on all major platforms early 2010, and PC mid 2011 via for Games For Window Live download featuring SecuROM - 0.5 activations available on install, more required for initial installation and can be bought via DLC. Gauss gun in DLC pack 1. All single player maps via DLC pack 2."

(Internet slits wrists)