Hi Dan,
Engineering is currently looking at implementing this feature for Windows 7.
The current plan is to have it available during the first half of 2011.
However, please keep in mind that this feature is not committed yet so the release date might slip.
If you want a definitive answer on this and a commited/more precise time frame, I would redirect you to account team and they should be able to provide it to you once available.
Regards,
Nicolas