The announcement of the highly anticipated Canon EOS-1D X Mark II is a matter of a few months at most. Still no reliable specs have leaked. The only spec I think is most likely correct is the 22MP sensor, The latest tidbits suggest the EOS-1D X Mark II will feature a sensor having 15 stops of dynamic range.
The same extension of dynamic range was claimed by Canon for the Cinema EOS C300 Mark II. However, as Cinema5D found out, it’s not more than 13 stops of DR that you get on the C300 Mark II. If you want to find out how Canon measured the 15 stops of the C300 Mark II, there is another article by Cinema5D about that.[via Canon Rumors]