On a totally separate note, we also received a tip claiming to have some specs -- we can't verify any of this either, but we're told that the device will have a 10-inch screen and look like a larger iPhone with a MacBook-like aluminum back, and that pricing will run $800 on contract with Verizon and $1000 without when it arrives in March. We're also told that the official name remains a secret and that Apple employees are still calling it by the codename of "K48" -- a name we last heard in May from the same source that pegged the iPhone 3GS exactly. This source also tells us that the iPhone will be coming to Verizon as well and that we'll see iLife '10 tomorrow, but there won't be any MacBook updates. A relatively safe set of predictions -- which is why we sort of believe them.
Just 13 hours to go -- we'll find out if any of this is the real deal soon enough.
Update: Based on some rough measurements, that screen does appear to be between 9- and 10-inches diagonal. Additionally, it looks as though there could be a front-facing camera on the opposite side of the home button (up top in these photos) due to that cutout section, though the images are really too grainy to know for certain.
Update 2: Our source has shared another photograph, this time showing an iPhone resting on the tablet for comparison. Check it out after the break (bigger image for inspection available in the gallery).
Update 3: Gizmodo managed to snag some images of what appears to be the back of the tablet from Chinese forum WeiPhone before they were mysteriously yanked. WeiPhone is the same forum that leaked the K48 name way back when, so who knows -- the image shows what could be RF testing, but one of them feels kind of render-y to us. Check 'em all in the gallery!