Nvidia's Shield just leveled up. Today, the Android gaming handheld is getting a huge over-the-air update that tackles several of the device's biggest problems. First off, the system's getting an update to Android 4.3 with all the little fixes and features that brings. The Shield's GameStream feature is out of beta, and PC streaming is more reliable and seamless than ever before. But third and perhaps more importantly, Nvidia's figured out a way to make loads more Android games compatible with the Shield's integrated joysticks and buttons.