Canon has been hard at work on multi-layer sensors and they will be coming in an upcoming professional level full frame DSLR we’re told. There will be two cameras based on this technology coming in 2015, one would expect a replacement for the EOS-1D X and perhaps another professional body with a high megapixel count. There was no mention of an EOS 5D Mark IV.
The high resolution camera is expected to be announced in Q1 of 2015. Even though we have heard from places unknown that such a camera would make an appearance at PhotoPlus at the end of this month. A Canon Explorer of Light has told us they’ve been promised a high megapixel camera to come “sooner than later”.
I suspect most of this came from Photokina chatter.