Having had the RC running like a breeze since the day it was first available, I know find that I cannot install my HP printer using the just released retail version, and HP still insist they don't support Windows 7.
Perhaps I'll reinstall the RC for a couple of months!
i have the 2575 too, using vista on a recent auto update it said windows compatibility, but as you say there is no hp driver yet. both ms and hp say after install of w7 goto windows update to get the driver.
my w7 not arrived yet so only know what i have just stated.
[have the impression the ms update will be printer only not scanner or copier, but might be wrong]