Adobe made available a beta of 2.0. All current lightroom customers can use it for the duration of the beta. I've been playing with it and from what I can see, quite a few MAJOR improvements and not just in the RAW detail. Non-destructive dodging and burning using live masking, 64-bit support, multi monitor support! and much more. Read Tom Hogarty's blog that I link to above for more. It also includes updated profiles for many older cameras.
Update: A great overview of the new features from Ian Lyons can be found here.