Between this and the rumor about a revamp of the APS C line, I'd be guessing that:
1. There is a new sensor technology coming that will be used across these units
2. The pixel pitch isn't changing much
3. That per-pixel exposure calculation patent sounds interesting
4. Combined with rear illumination (which, I'll say again, I'm shocked that it is even considered an innovation. I'd always assumed that was the way sensors worked...)
5. Combined with pixel binning of some form.
6. Probably a new series of Digic to process the mess.
What about a depth sensitive sensor, sorta like Foveon, but eliminating the red issue with a new color filter array, with alternating pixels sensing (by depth) two colors each, RG and BG. Leave the BG pixels unfiltered so you can get full LUM data, Green depth, and blue depth. Then have a yellow filter over the alternating pixels to let red and green have at it. You get 100% green coverage, and 50% each true b&w, red, and blue, instead of 50% green, 25% red, and 25% blue, and no full luminance data. If you wanted to get real fancy, you could still sense for a noisier red value from the unfiltered pixels, giving you 100% red coverage in good light.