the incompatibility will be solved when you do it "run as vista" via properties
if it works on your current vista, it will work on 7
drivers should work from vista (even xp if i'm not mistaken)
but usually you'll get generic ones, so again if it works on vista, it will work on 7
since you aim for 7 RTM, SP1 installation is a must
unsupported ?
win 7 will come to same phase very soon ...
you ain't gonna miss anything, except garbage updates