And it's starting on the 31st of the month. THQ say: "The beta is scheduled to go live on Monday 31 January when global press and key Dawn of War® community members will be given access. It will then broaden to include everyone who has pre-ordered Dawn of War® II – Retribution™ on STEAM to date on 1 February. Finally, anyone who has bought a Dawn of War game through STEAM or has registered a Dawn of War II product on their STEAM account will automatically receive an invite on 8 February. There will be no open registration phase to this beta." Full details here.
The beta will feature all six multiplayer races from the forthcoming expansion, including lovely, squishy Imperial Guard, and holy crap I am overdue getting into a multiplayer RTS again. This could be it.