Ars Technica: Microsoft's Kinect launched with the company telling gamers that their body was now the controller, and the first line-up of games relied on motion control exclusively for their game mechanics. This wasn't the launch of a new peripheral—it was Microsoft treating their new-fangled camera as an entirely new platform. The marketing message was clear: you did not need to hold anything to play.
This year's E3 saw Microsoft softening on that stance, and now a variety of games aimed at the core audience are treating the Kinect as a peripheral, an add-on that will bring extra value to a number of core games. With the hardware a hit, expanding the audience to hardcore gamers could go a long way to keep sales strong.