Application Virtualization 4.5 Documentation
There has been a host of documentation and announcements around Application Virtualisation recently. I would suggest that you read the App-V team blog here. Of note though are several whitepapers that have been produced to help you evaluate, and deploy App-V and integrate it with SCCM R2. See http://technet.microsoft.com/en-us/appvirtualization/cc843994.aspx for more details.
