I'd be extremely happy with 10 Bit Raw! 
Anything is better than the current 8 Bit 422 (with the new uncompressed hdmi update). 
  
Would it be possible? 
Why not team up with Atomos? The Ninja-2 is capable of recording 10Bit. 
Think of how much business this would give Atomos!  
  
Canon 5D Mark III + 10Bit Raw 4:2:2 + Atomos Ninja-2.  What a combination! 
  
(An instant Blackmagic killer...) 
  
A possible dream?