So there appear to be leaked screenshots of some new camcorders from Canon, as per Canon Rumors and CanonWatch.
The GX10 and XF405 both do 4K. These probably have the Digic DV6 processor we saw in the C200, and can shoot 4K without a fan. That will be promising in that it means that the Digic 8 will be able to do the same thing, and when that processor gets released in new cameras, hardware encoded 4K will finally arrive in consumer Canon products. My guess is that the 7D3 and/or the next R