Hm, I doubt it would make much sense to start support for Windows Vista now.
It´s not even finished, it´s not sold yet...so why make things more complicated?
Why should it? Who knows what will change in Vista between now and the final build. Maybe after fixing the bug in the current beta 1 Vista it could be broken again in beta 2 and even in the final build.
Now Scawen just spent his time supporting a beta OS instead of doing something else like, oh I dunno, getting S2 out of Alpha stage