From server 08, yes, from XP pro, no.
See the original idea was to start from 100% scratch, however they scrapped that about 3 weeks into the job. So they based it on server 08's junk,but, tweaked it, and are pushing it for a "gamers market"
regardless how it happened, Microsoft actually made an OS that improves the performance of your PC, at stock settings for the OS none-the-less.
Which really gives a lot of hope for 7, even though its not the 'true gamer OS" we all hoped for.
Personal experience on the p3 I had with Win7, my games ran 5FPS faster, felt smoother over all, and I experienced much less "hang time" in between applications and games. Also, no crashes or BSOD's lol.