Other features of the device include a slider which lets you change the top screen's 3D display from ... well, 3D to 2D. There are "improved graphics capabilities" as well. Control inputs include a motion sensor, gyro sensor, and a "slide pad" (That thing above the oddly-placed D-pad). There's two cameras on the outside (which captures 3D images) and one on the inside. The 3DS will also be able to connect to Wi-Fi download spots and communicate with other 3DSs, even when in sleep mode, and could hypothetically download new content when you're not paying attention. The device's online services will have no monthly fee.
The top screen is apparently capable of displaying "3D Hollywood movies," and, as Nintendo mentioned in the past, is capable of doing so without any stupid-looking glasses. As far as the improved graphics -- well, if this Kid Icarus: Uprising trailer is in-game, then it certainly seems like a huge step up from the current generation of DS. We'll have a more thorough write-up on the device when we try it out on the E3 show floor.