MS can't include it as a part of SP2 since SP2 has already been
released. They would have to wait until the app goes final, and then
include that final version in a new service pack, SP3. However, this
is unlikely to happen since Windows Vista is likely to be out before
SP3 would be released since the service pack would have to have a ton
of alpha (pre-beta) and beta testing before it would be released.
Since MS stops making service packs for older versions of its Windows
OS once a new OS hits the market, then this likely will never happen.
Alan