Hopefully their retort will be a 5D-C that records 1080 raw for $4000. But that'd piss off so many purchasers of the original 5D3, that I doubt it will happen.
Personally (as a 5D3 purchaser myself) I'd love to see them come out with a 5D-C at a price point below the 1D-C. I have no need of 4K - it would be cool to have, but I'm also realistic. As for being pissed about the 5D3, I knew what I was buying when I got it, nobody put a gun to my head, have been very happy with it, but I still look forward to what might come out next