would be about time...already threeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee months
OK seriously, I know it's gonna be a beta/RC (the SP) during months and won't be released before May or June. It's not that badly needed yet is it
Personally I wouldn't install a beta service pack
It was OK to run the beta of the OS, the RC too, living "dangerously" a few months (just kidding, they were stable, otherwise...) but I won't risk an unfinished upgrade on my final version install