Nintendo, as promised, has teased the first details of the 3DS at its E3 keynote. The console superficially resembles the DSi but has a new, 3.5-inch top screen with glasses-free 3D; it not only adds depth to games but has a 3D effect slider to tone the effect down. 3D also plays into photos, as the back holds dual cameras that can create 3D images for sharing with others.
