Some good stuff in there based on info published on TechNet. Mostly "under the hood" type improvements so don't expect much in the way of earthshaking new features.
I don't see anything so overwhelmingly important that it can't wait a week or six for the feeding frenzy to subside - and the inevitable gremlins to be discovered and patched.
Barring any surprises surfacing, W7-SP1 looks like it will be part of my system's annual Spring cleaning since I usually migrate all my Windows hardware over to the latest OS once the first service pack comes out.
S'long XP! It's been fun. Mostly. Maybe we can get together and talk about 'old times' on a nice VM someday, huh?