I saw that too and was intrigued. But I assume it means I'll need to re-install everything...yes? What I should do is prepare a new removable drive, and download it to that. OTOH I don't think it's actually downloadable now, but that you reserve a copy.
Also, does anyone know for sure what kind of model Windows 10 is going to use? A subscription model, or something like Cakewalk's Membership model, or...?