You may know the official ship date of Vista (for corporate customers), and you may know what the packaging will look like, but do you know Microsoft's licensing scheme? Originally, Microsoft was going to allow only one transfer of Vista between devices—not good for people who frequently upgrade computers.
Enough people complained to convince Microsoft to relent its previously hard-line stance, since they've now changed the EULA to allow what seems like an infinite number of transfers as long as you "uninstall" the software from your previous machine. Still no "sharing" of licenses, but you can apparently use Vista on as many machines as you want.
Microsoft Capitulates on Vista Licensing Terms! [Maximum PC]