This is not new (since it happened last week) but I wanted to recommend you these two posts since I think they are the ones that include the most useful information about the announcement:
In the Hyper-V shiproom, we have signed off on Hyper-V RTM (Release To Manufacturing). The build and articles are actively working their way through the systems and will be available from Microsoft Download Center from around noon Pacific time. While waiting, please take a few moments to review the information in this post, plus the appropriate Knowledge Base (KB) articles I’ve linked to. There is a significant amount of information to take on board. It is fantastic for me to be able to publicly state that Hyper-V is released and ready for production deployment.
As you can confirm on the press release linked below, the final release of Windows Server 2008 Hyper-V was just announced.You can download the final version (number 18016) immediately from the Microsoft download web site. This version will also go to Windows Update on July 8th. Below you will find a collection of links about Hyper-V.
Posted by Gabriel Maciel