Nvidia showed off their new portable gaming
device at CES2013
At CES2013 Nvidia announced their new mobile chipset the "Tegra4" which will have a 72 core GPU and a Quad-Core Cortex-A15 CPU, as well as a 4G LTE modem. This new Tegra4 chipset will power the Shield as well some new devices to come this year.
The Shield will run stock android thought it is yet to be unveiled which version, from the press conference it appeared to be JellyBean. It also seemed to be using a modified / optimized version of TegraZone as well. the controller is set up like a edged out Xbox360 controller with Micro USB, HDMI and, Micro SD slots. They also demoed streaming PC games like Assassin's Creed III and playing then in the Shield.
The Nvidia Tegra4 looks like a must have for hardware manufactures (because of it powerful core that is both power efficient and, functional). I'm a little weary of the Shield because it can either be a hit or a miss depending on its price point. Personally i think it would do excellent at the price of 179.99 but, realistically they will place it up there with the price of the PS Vita at like $249.99 which can be a deal breaker.