The Panasonic G7 (G6 pictured above) will be announced soon and it’s been rumored to have 4K video (although how comparable to the GH4 remain to be seen).
Sadly the sensor seems to be more of the same old, a theme for m43 cameras.
Don’t hold your breath for 5K video from a Nikon DSLR as 12 bit 1664 x 1100 resolution is what is provided right now. But the live-view stream is 4992 x 3280 pixels and it should be available to be captured. Even if live-view is captured, it would likely be at a lower frame rate than 24fps.
When the Magic Lantern team first started capturing live-view on Canon cameras they were not sure what they could do with it but they quickly made it into very useable frame rates. So it will be interesting to see how this development goes.
You can view the thread about this raw video hack on the Nikon Hackers forum and below is a raw frame example of what they have done so far.
Rumors have been circulating about the successor to the Canon 5D Mark III that will have 4K video recording (likely with a unsatisfying video codec if Canon remains consistent in its approach).
The main rumor has been 28mp, 9fps, and 4K video, to be released around September. One other source has suggested 32mp and a release date that makes it questionable if it will be out before the year end.
In a recent interview one of the Canon high up staff acknowledged that Canon as a company needs to move faster in releasing its products. Let’s hope the Mark IV will surprise us as the Mark III was a disappointing update from the Mark II.