Below is a new high definition trailer for Warhammer 40K: Dark Millennium Online. The trailer was unvailed at GamesCon 2010 by Virgil Games.
The first playable race is The Imperium of Man. There will be several other playable races and two factions. Three revealed character classes were Space Marines, Adeptus Mechanicus Tech Priests, and the Imperial Guard.
The below high definition is about 1 minute long. Check it out below.
Warhammer 40K: Dark Millennium Online HD Trailer Video: