It's been reported a number of places that there's a second (private) RC at 7200 now and they're branching builds again.
And as far as the Service Pack, they're likely either:
(1) Doing one right away to appease the IT departments that don't want to install a new OS until the first service pack is out, perhaps even with a bit of humor to it, or
(2) Doing tests to confirm that service packs get incorporated into the system correctly -- essentially "dummy" updates like some things they've already pushed via Windows Update at times.
Anyway, actually wouldn't suspect a fake.