Those of you who have followed my blog for a while know that I've - for one reason or another - been referring to Windows Server virtualization by its codename, which caused some initial confusion. There's a reason that I did this - I knew that the name was changing, and I didn't want to send a whole lot of information out into the web with a name that wasn't going to stick. I'm sure there were times when I actually said "Windows Server virtualization", but I tried to keep it to a minimum.
At any rate, the product name has now been officially announced: Microsoft Hyper-V.
The press release has some very good information as well, including the suggested price for Windows Server 2008 with Hyper-V: $28USD more than Windows Server 2008 without Hyper-V.
Update: I've clarified the statement about pricing.