Here are a few more things I can tell you about the game that are actually confirmed: The battle mechanics won't work like the majority of MMOs that we've seen, in WoW you just run up and start hitting something, in 40k the combat will be something like Gears of War, it will rely heavily on cover, flanking and other combat maneuvers. The likelihood of races mixing parties and raids or whatever will be unlikely, and each race will likely be it's own faction.
I've been picturing a much more gothic and grimdark tabula rasa style game. Weaponry and cover but still within an initiative/turn based combat system.
Tabula rasa had an interesting take on MMO combat, but unfortuatly hade a host of other problems that saw it ground into the dust.
40k likely has the brand name behind it to avoid such a fate as long as it's handled with care.