That's unlikely as it wasn't necessary when Leopard came out. When Windows7 comes out, expect to download updated bootcamp drivers for it, which won't require a reinstall either.
My guess is no mainly due to them being on two different partitions. But whenever I reinstall OS X (which is rarely) I always completely wipe/reformat the entire disk. Peace of mind I guess. I don't mind fixing settings and whatnot, I love the feeling of a clean install. It's like an organized desk. Refreshing.
I'm pretty sure M$ will put out an update that updates RC1 to 7, but will require a valid CD Key to continue using 7. Therefore I don't think it will require an re-install.
I'm pretty sure M$ will put out an update that updates RC1 to 7, but will require a valid CD Key to continue using 7. Therefore I don't think it will require an re-install.