So how can you get your hands on App-V 4.5 RTM, well the answer my friends is on https://licencing.microsoft.com.
You can download it today from the MVLS website.You will obviously need to have a valid agreement to download software.
1. Go to https://licensing.microsoft.com
2. Log-in using Passport account
3. Go to the Products Download Section
4) Under Windows released 2008-09-04 you should see Application Virtualization 4.5.
5) Once you select that you can select Language and your download speed and away you go!
Note: Remember you are governed by license agreements and product use rights so you must have a valid MDOP license.
Also be aware that this download name will likely change over the coming days to reflect Microsoft Application Virtualization Hosting for Desktops 4.5. Do not be confused by this ! These are App V 4.5 bits and valid for you to download.
Happy Virtualization peps!