I'd expect Canon to announce a prototype, and show off the benefits of their technology, as they have in the past, before actually using it in a product. There certainly isn't any guarantee that would happen, but it doesn't feel like the technology is ready yet. I expect more patents on the technology, and a prototype test, before we actually see a competitive layered sensor in a DSLR.
Is this something you would want to actually introduce, and not trail?
I can think of few better ways Canon could produce its own 'Osbourne Effect' than to show something so different whilst still churning out a range of cameras with 'existing' technology.
Much like Craig, I've had quite a few 'rumours' sent about upcoming 'new' sensor technology, but nothing overly convincing, and nothing from anyone who's genuine (i.e not hiding behind anonymity) understanding of sensor technologies I'd rate.
Canon wouldn't be pioneering layered color sensor technology. That was done with Foveon. Canon certainly wouldn't be the "first" with a layered sensor if they released the 7D II with one.
Also, keep in mind, the very vast majority of "cutting edge" sensor technology has never made it's way into a DSLR or Mirrorless camera. Sony's Exmor technology is a pretty interesting step towards a better, more integrated sensor design, but even that is still a very far cry from the most cutting edge sensor technology. Most of the really amazing stuff is in video sensors and small form factor sensors...the ultra tiny 1/8th inch sensors that are used in phones, tablets, and other small and cheaper cameras.
In the grand scheme of things, Canon is a "little" behind, Sony is a "bit" ahead, when it comes to large form factor sensors. The technological differences are far from large, and not even remotely close to huge. The single largest differentiator is low ISO noise, which is largely due to Canon's ADC units, which are not actually part of their sensor at all...they are part of the DIGIC chips.
Both companies larger sensor technology is quite far behind the level of technology employed in smaller sensors, though. Even Sony's small 1/3" ICX CCD sensors have better technology in them than either Canon or Sony DSLR/Mirrorless sensors.
Canon could easily close the gap if they either fixed their ADC units in the Digic chips to introduce less noise, or move to a lower frequency on-sensor-die column-parallel ADC approach. All the rest of their sensor
technology is actually very good. If they employed more of their noise reduction patents, they could dramatically reduce dark current noise (which can be problematic for higher ISO settings and long exposures), reduce readout frequency when a high speed readout is no necessary (lower frequency reduces noise), etc.