Accoriding to the listing on ebay here is a chance to bid and win on an iPhone 6 prototype. The seller is “ also giving a 110% guarantee on this being an authentic Apple prototype device.”
From the auction itself.
For sale is a brand new never used Apple iPhone 6 Prototype. Apple does NOT let these phones out of their possession yet I was accidentally sent one upon renewing my contract. As you can see from the photos, iOS8 has not been placed on this device, rather it is in the true developer mode. There are no FCC markings on the rear of the device or a model number. This is the real deal!!! The lightening port is red which is a sure sign of a prototype.
Im not going to say this seller is lying but the OS looks anything like a developer mode that Apple would have internally but who knows?