Well this is a tantalising find. Boy Genius Reports reports that some MobileMe users are seeing their account type switch from "Individual" to "Full Member," the hope being that a WWDC announcement will make everyone a "Free Member" by default.
As Matt explained, MobileMe's services aren't really a luxury anymore, and users are increasingly growing to expect that type of seamless, automatic syncing on their devices. Announcing a free, basic MobileMe service at WWDC would go a long way to getting Apple's head in the cloud and fulfilling that expectation. [BGR]