My brother tells me that the Sony CCD used in the TX-1 is the same as the ones used in other Power Shot cameras, and that it's physically impossible for the CCD to yield the 1280 x 720 video on it's own at anything more than 5 frames a second. This, to him, suggests that the resolution is simply upscaled via software.
That, to me, suggests that it could be applied tother Canon cameras.