A device made by ASUS with the product name of P1801-T has taken a tour of the FCC. Not much is known about the device, but Engadget suspects that it could be the Transformer AiO prototype that was seen back at Computex in June. Their reasoning behind this suspicion is solid and based upon the naming convention.
The prototype ran dual OSs, but these sorts of details aren't revealed in the FCC filings. It's expected to have an 18-inch screen. Benchmarks have surfaced on GLBenchmark showing the device running Tegra 3 graphics and a Cortex A9 CPU. The screen resolution is put at 1920x1080.
It appears, from the original PR, that the device could be paired with an x86 desktop counterpart and operate as a wireless display. If done right, this could allow the tablet to function as a desktop PC whenever you are home (or in your office). This would make an 18-inch tablet a bit more palatable.