We haven't heard much from Vigil Games since May 2008 about this title, but what we know sounds promising so far. The MMO's creative director is none other than comic book artist extraordinaire, Joe Madureira (side bar: my favorite artist of all time). Vigil hopes to stay as true to the tabletop experience as they can while still remaining an MMORPG. Finally, the world's primary weapons will be guns and vehicles may play a large part in combat.
While many fans of the Games Workshop miniatures game have found a familiar home in Warhammer Online, many others have complained that Mythic's incarnation of the Warhammer setting is not harsh, gritty, or dark enough. It will be interesting to see if WH40k can capture this or if Vigil will opt for a less mature environment (and rating).