It’s a hallmark of the tech rumor that the closer you get to a product launch, speculation splits into two genres: the cautious and the wild-eyed.

In the second camp Monday comes the latest news from Boy Genius Report. Citing an “incredibly solid industry contact” that BGR doesn’t quite seem to believe itself, the source said that Sprint — and only Sprint — will get an iPhone 5 at launch, while Verizon and AT&T will get the iPhone 4S. Not only that, the report says that the new device will have a larger screen, more storage, have a dedicated Assistant button, and that it will be a 4G WiMax phone and that AT&T and Verizon will sell LTE-enabled iPhones next year.

BGR’s Jonathan Geller’s report comes on the heels of a Wall Street Journal article that claims Apple and Sprint have entered into a $20 billion deal for the iPhone. Sprint spokesman John Taylor declined to comment on the Wall Street Journal report.

That’s a hefty chunk of change, but would it really be enough for Sprint to get an exclusive over Apple’s existing carrier partners? That seems unlikely, at best.

Related stories:

More technology coverage from The Post

Apple’s iPhone 5 buzz hits high before event

Reports: Apple iPhone 5 cases turn up in AT&T inventory