We've got good news for you though: THQ has released a huge list of data on design, gameplay, classes and races, and much more. The information ranges from all-encompassing, such as talk of art style and who is involved in development, to very specific, such as a party size of five, raid size of 50, and level cap of 60.
There's plenty more for eager fans: dual-wielding pistols and melee weapons (including chain swords), classes with three specialties, a crashed space hulk ripe for exploration, and much more. Strategy Informer has the complete summary, so head over there for your full Warhammer 40K: Dark Millennium Online fix!
[Thanks to Merketh for the tip!]