A few days ago, we reported on a rumor of a motion-sensing add-on for the Xbox 360, which came complete with a features list and a picture. Today, we've got an update on that, albeit also as a rumor form, this time saying that it may even have been already demoed at the Consumer Electronics Show last year.

Ars Technica is not all too sure, but they do believe that they have played the "Wii Killer" already, claiming that they have, in fact, seen the "exact same technology at CES 2008." To make things even more intriguing, Microsoft is making as much noise as it can for the upcoming E3.

Here's the juicy bits of Ars Technica's recount of last year's suspected demo:

At CES last year we met with a company called 3DV that showed off a small Web-camera-like device that was able to detect movement and interaction in 3D space. We even played a boxing game that worked very, very well. Even more impressive was the ability to control media functions with gestures. You could swipe you way through your movies, interact with pictures, change channels, all with a small camera and your arms. Imagine a Microsoft Surface -- without the Surface.

Doesn't that sound like magic! But wait, this technology is from 3DV. It doesn't have Microsoft's seal stamped on it...

Actually, it's not too far-off that seal will be there soon if not already. Back in February, Reuters reported that Microsoft was buying off 3DV. It doesn't take rocket science to figure out why MS could possibly be interested in them, right?

All in all, it really does sound promising. And if this is the big thing that Microsoft is gearing up for E3, we say they just might steal the show.

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