Considering we heard about the larger hard drive nearly a month ago via an FCC filing (those things don't lie people!), we're pretty sure the Sony's just holding off on an announcement until the Tokyo Game Show next week. Those three UK-based PS3 bundles now seem to be that much more likely, don't they?
Update: Sony America says, "That tip is a complete fabrication." To be clear, this statement does not represent SCE (Japan) or SCEE (Europe), though it does absolutely deny the existence of any 250GB PlayStation 3 bundle in the US this year.