At the moment there is some junk around the borders of the frame that needs to be removed (full image was 2080 x 1386), so it ends up cropping down to a little more than 1080 (click for larger):
These really give you a sense of the dramatic improvement. : Big thanks to Luke Neumann for sending me a few more examples. The firmware is currently running at 10fps. Right now the files are about 5MB a frame (pretty large, the one I have is 4MB), and at least on the Mark III the resolution is currently 2064 × 1064 (that's the sample file I have, people have also been getting varying resolutions, especially on the Mark II). The team has been working on their own uncompressed HDMI hack (different from the one they currently have and different from Canon's impending update), but in the process, they have basically enabled 14-bit RAW still images from liveview without the mirror or shutter moving.
They have made significant discoveries trying to enable full uncompressed HDMI, and not only do we have RAW still images from the liveview video stream, but they've actually managed to get RAW video working on Mark III. It would be interesting to know if Canon is actually aware of what their cameras can do, or if some of these are happy accidents for the team over at Magic Lantern. Every day it seems things get more and more interesting with what these Canon cameras are actually capable of.