I was very dissapointed in the lack of details about the upgrading procedure. For one thing, no-where on the pre-order site could I find what OS's you are allowed to upgrade from. I assume XP Home and Vista Home upgrade to Win 7 Home, and XP Pro and Vista Business upgrade to Win 7 Pro, but they never said anything definitive.
Also, will I need a CD key, official media, etc.. to actually perform the upgrade? I have an old XP Pro CD for my own computer, by my fiance's XP Home is an OEM version, and I don't have a Microsoft-branded CD.
Of course, since Win 7 copys everything, and what you can run is based on the product key you enter, maybe its doesn't matter, but it would have been nice to know in advance.