Microsoft Game Studios chief Shane Kim so far isn't talking about whether or not his company is working on a motion-sensing controller for the Xbox 360, despite rumors persisting since last year over such a peripheral designed to combat the Wii remote.  To be sure, Kim noted that Microsoft is still committed to the continued development of hardware for the 360, but there's no clear indication from his company whether this includes built-in motion sensing for gaming.  In an interview with Wired, Kim comments:

If you want to say that that means we're working on something, that's up to you. Here's my point about hardware: You know that we're investing pretty heavily into hardware, online services, and content. And regardless of what that underlying technology is, we're going to continue to push innovation in a whole bunch of different places. Whether that's in motion-sensing or some other area, we'll see.

A third party motion-sensing mod is in fact already available for the 360 controller.  However this component requires some solder know-how to install into the bottom half of a 360 controller shell.  It reportedly works with some 360 games, but being third party it's not likely game developers will support the component's functionality for their software titles.

Microsoft's Entertainment and Devices VP Don Mattrick earlier claimed victory in the next-gen console wars, thanks to the Xbox 360 being the first to reach a North American shipment milestone of 10 million units.  Perhaps with such boasts in mind, Kim stressed that it is in fact still too early to decide a winner in this race.  According to Kim, the real victor will emerge when one of the console giants reaches 100 million units in sales first.  With both Microsoft and Sony gunning for seven- to ten-year life cycles for their latest consoles, apparently this milestone will be a safer bet; the Wii is also proving to be no slouch in terms of sales on a monthly basis!  In other words, Kim believes no one company stands to dominate the console market as it stands now, unlike how it was before.  Will the DS and Wii one-two punch prove otherwise, assuming their momentum outlasts their competitors.  Then again, the same precaution applies to the 360 and PS3 as well.