Well until it is officially released (and we are pinged for $39.90) it is a time limited beta, so it is a moot point.
If you need Vista that bad perhaps you should reassess why you are using a Mac (seriously). There is no compelling reason for even Wind0ze bois to switch, even less for Mac heads.
You can install Vista easily under Boot Camp by upgrading from XP. You can do it as a normal install as well, but I think there were extra things that needed to be done.
When I get my MacBook Pro soon I'm gonna do just that. I'm gonna install XP, and then use Vista to upgrade the XP installation. I hate Windows with all of heart, esp. Vista, but I wanna see just how much of an OS X copy it really is.