[quote name='Indignate']Isn't Kinect just a mic? Why can't I use a headset for this?
This would make playing a mage a hell of a lot funner as I would use more spells if I didn't have to go into a menu every time to switch them.[/QUOTE]
The way Bioware described it for ME 3 is the Kinect does the processing of the voice commands and just sends the same data as a button press to the game to generate the action. If it was done with a headset, the system/game would have to do the processing and that would affect graphics, sound, etc. in a negative way.
The reasons this has to be done in a patch for Skyrim is 1. the game wasn't designed with this so some files need to exist on the HDD for the processing and 2. there are new commands (quicksave, quickload, etc.) included in the patch only for Kinect.