The current Nikon D4s has a native ISO up to 25,600 while the new D5 may go up to 102,400!
More rumored specs of the Nikon D5
- New 20MP FX sensor
- 4k video
- 173 autofocus points
- Native high ISO of 102,400
- 15 fps
- Body design similar to the D4s
- Announcement expected in late 2015 or in early 2016.