Microsoft released the Application Virtualization (App-V) 4.5 CUI for the Windows 7 Beta. All subscribers of the Microsoft Desktop Optimization Pack (MDOP) can head on over to Microsoft Connect and register to download the update. This release will have access to the new technology for free as part of their current licenses.
There is also a KBarticle that describes CU1 for App-V 4.5.
In a related new, Microsoft will be opening the Technical Adoption Program (TAP) for App-V 4.6 shortly. When released, App-V 4.6 will be available to all existing MDOP customers and provide new key features including 64-bit platform support. Customers interested in App-V 4.6 can watch for registration to become available at Microsoft Connect in Q1 of 2009.
Source:→ MDOP Blog