We're told to expect “a bunch” of 4K products from Canon, starting in early 2015. There will be products in the EOS line, Cinema EOS line and possibly the VIXIA line.
Both the EOS C300 and EOS C500 will see updates in 2015, with the EOS C300 replacement gaining at least 4K. We have no idea if Canon will follow ARRI into 6K territory or not, but judging by Canon's strategy thus far, I don't see that happening. Though a good source keeps telling us Canon has its sight set on being the “A camera”, and that there could be a different form factor Cinema EOS product shown at NAB.
As for 4K DSLR's, we weren't told which camera(s) would get the capability. I asked if the 7D Mark II could possibly get 4K via firmware, to which there was no clear answer.
More to come…