Just announced at the Nvidia Press Conference
Tegra 4 powered, Android OS..... Looks like a controller with a screen attached.
5 inch 720p multitouch retinal display
link to the product on the official nvidia website.
Has HDMI out to play on TV's and etc. Looks kinda cool.
They played some Hawken on it and seemed to run well, albeit lower quality looking.
They also showed that it has capabilities of streaming PC games from your computer to the device and play your Steam games through the device. Using their new GFE (geforce experience) program, NVIDIA GTX 600 Series required for streaming pc games.