Nikon and Canon are both expected to update their flagship cameras in the next 6 months or so. Nikon with the D5 and Canon with the EOS-1D X Mark II.
While little is known at this point about what Canon will release, we're seeing more leaks of potential specs for the Nikon D5.
- New 20MP Sensor
- 102,400 native high ISO
- 4K Video
- 173 AF Points
- Body design similar to the D4s
- Announcement expected in late 2015 or in early 2016.
If Nikon releases a flagship DSLR with 4K video that isn't hampered in any way, Canon is almost required to follow suit in my opinion.