Paul Thurrott has revealed the Windows Vista product editions today. Basically, it comes down to the fact that the Windows team was jealous of all the different product editions the Office team has wielded since 1997. :P
Windows Vista Home Premium will be a good buy for most home users because it contains Media Center functionality and doesn’t have a lot of the additional overhead stuff the Business editions have. I hope to see either Vista Enterprise or Vista Ultimate deployed – integrated Virtual PC will be sweet! I most certainly am getting Vista Ultimate for my Vista-capable PCs at home.