From "The official MDOP Blog"

MDOP 2008 R2 Release to Manufacturing!

Just a week after my colleague Shanen Boettcher wrote about virtualization and its role in the Optimized Desktop, specifically announcing the RTM of Microsoft Application Virtualization 4.5, commonly called “App-V”, I’m proud to let you know that the entire MDOP 2008 R2 suite of products has officially reached RTM status! New and existing customers can get App-V 4.5 starting TODAY, and will be able to get the other MDOP 2008 R2 components the first week of October!