Canon Rumors writes:
We’re told that a 4K fixed lens camcorder is coming in the early part of 2015. Such a product would probably fit in with CES as a consumer product announcement. We’re told the camera is called the XC10, and it will have similar ergonomics to the EOS C100, but it will have a fixed lens.
A lot points to the fact that Canon will implement 4K on cameras in 2015. The EOS 5D Mark IV is also rumoured to feature 4k.