This is pretty crazy.
http://www.engadget.com/2014/01/07/panasonics-4k-mirrorless-gh-camera/
A 4k camera at under $2k.... shame it isn't a Canon. :-/
Interestingly it says it records at 200 Mbps which is not 200 MB/s.
That works out at 25 MB/s, which is just about as fast as an SD card (or slightly faster).
I wonder if it's a typo?
EDIT: Yep that's a typo for sure!