Although he did not name any names, it wouldn't be surprising if this turned out to be the other console manufacturers, Sony and Microsoft. After all, they both already have their own motion-sensing controllers; they might be seeking to improve the tech in the next generation.

Joe Virginia, bigwig in InvenSense, has this to say about the matter:

With six degrees of freedom you can basically make any movement at all [...] Six degrees of freedom is the holy grail. [...] But if you think of where motions and where motion-sensing can be applied then there are so many applications; this is a great time to be in the business.