A new source recently contacted us to state that they can confirm that the Canon 1D X Mark II will have 4K video (but not 60P). However, this source hinted that the codec was limited and that the implementation would be disappointing to most people (which is consistent with Canon’s video for dSLR implementations). We have no way to vet this source so we will wait to see if their words hold true.
We were hoping that Canon would switch to CFast cards instead of compact flash to allow for better video performance.
Most the rumor sites are suggesting that the 1D X II will have a 20mp sensor, fast frame rate, and better dynamic range.