It sounds like Canon is identifying and solving a number of issues with layered sensors. Given that, and given that their patent filings are still being published, I am not sure we'll see a layered sensor with the 7D II. The issues would need to be worked out first. It's possible all of these were filed a 18-24 months ago, and the technology is ready, but there could also be ongoing work.
I'm still waiting for a Canon patent that shows they figured out how to reduce noise and increase dynamic range in a layered sensor. I think that would make...well...everyone's day.
It's intriguing that Canon is working on a layered sensor, though. At the very least, it gives some hope for the cameras that come after the 7D II.