You can read the latest Hellgate: London preview at Jolt.co.uk. The big thing in this game is clearly the randomly generated element:
Hellgate: London is a first-person action RPG, but the main thing that sets it apart from almost
every other RPG is that the world, quests, items and events are all
randomly generated (to a certain degree). It’s also set in the modern
day (well, 25 years from now to be precise) and aims to have more
action-oriented gameplay than the traditional fare, combing hacking,
slashing, shooting and blasting with a far more immersive viewpoint.
I'm looking forward to it. I enjoyed Diablo 2 a lot, and this game seems to have a much more interesting setting.