Looks promising but I hope that THQ know what they're doing. There has been much discussion about the possibility of a 40K MMO and well many have resulted in evidence against it happening being monolithic in comparisson as for it to happen.
I would very much like to see a 40.000 MMO but the only way they could probably do it would be if focus would be laid upon the Imperium of Man. There would just be to many factions present and even if they were to pull that off it would most probably become either imbalanced or just not enough people or just a vague story. When it comes to Warhammer I favour the Imperium above all else and would enjoy it very much playing as one of its troopers, inquisitors or what not.
The concept art suggests that other races than human will be possible (the orkish build on vehicles and the Waagh mark) so I'll eagerly await news on how the want to pull this off.
Sweet job bringing it up Harl, didn't know they were working on it.