The handheld console it's called Shield and it's an Android device that can natively play android games and stream PC games from a nearby computer with a NVidia card.
Citing GamesIndustry and according to Nvidia, "Project Shield combines the advanced processing power of Nvidia Tegra 4, breakthrough game-speed Wi-Fi technology and stunning HD video and audio built into a console-grade controller." It can be used to play on its own integrated screen or on a big screen, and on the couch or on the go. Project Shield can instantly download Android games, including Android-optimized titles available on Nvidia's TegraZone game store. It can also be used as a wireless game receiver to a nearby PC equipped with an Nvidia GeForce GTX 650 GPU or higher.
Official Nvidia site here for more info.