"We haven't officially announced anything yet," wrote Dawn of War II producer Mark Noseworthy coyly in a forum thread. "The images are pretty interesting though. That is indeed a picture from our Map Editor."
Both the original Dawn of War and Relic's WW2 RTS Company of Heroes--built upon an earlier version of the Essence Engine DoW 2 uses--received editors soon after launch.
A huge Dawn of War II update titled "There is Only War" is currently the works, bringing eight new multiplayer maps and a large-scale rebalancing--as explained in a battle report. The update is due in the summer, with an open beta set to begin in early July.