Evidently that's what is happening right now with those who has followed the ML's progress. I already have a 5DMIII. So its a no brainer. Wait a week or two and see if the 4GB barrier limit could be breach and maybe someone could come up with a way to tap into the CF card I/O and record SSD instead. Faster and cheaper CF cards maybe. That's still speculation. Hey a few weeks ago we all thought getting RAW video was impossible with DSLR. Workflow is quite easy. A bit like timelapse footage processing.
I also like the Nikon D800 BTW. A top notch DSLR for bill board size digital images. Even the clean HDMI with a Nano Flash to Pro Res is nowhere near what you get out of ML's EOS RAw.
I am still uploading some of the newer ML's nightly builds. Those guys are some seriously clever people. Fearless too. Imagine if they could do the same for C100 or C300. Canon is surprisingly quite on the matter.
I would not knock the quality coming out of the C300. That is one nice camera for low light and it does not suffer much with magenta cast sometimes I see in other S35 sensor cinema cameras for underwater. I suspect the C300 is capable of a lot more. ML can't really touch the cinema cameras nor the 1DX/1dC. It is a wonder that Canon has not even twitch a whisker with all this frenzy of 5D MIII hacking activity.
I managed to shoot some 1920 x 720 raw with a Sandisk Extreme at 90 mb/s clips.