It's available for Platinum support customers and should be available for gold customers soon if not already. I just upgraded over the weekend. Out of 50+ client rollouts, about 6 didn't take initially. 5 of those worked after a reboot and rerollout. On one, it still wouldn't work and I was getting the install was interrupted message when I tried installing from the machine itself. I found the fix in these forums, Msxmlx.inf was marked read only. Unchecking that fixed the issue and I was able to install successfully.