Swap a new censor into the 1dx and you get your 4k dslr. I agree with the previous posters who say it will be 4-6K in price. They want to undercut RED.
I hope they don't just make a DSLR for video. If you shoot video you don't want a dslr you want a video camera. There is nothing about DSLRs that I like except the video function. The form factor and features of a DSLR are not convenient for video.
If it is directed towards the film world and undercut the RED than I think that they would have to make something more modular. Possibly something that looks like a dslr but with more video options. Take out the mirror, add more video functionality. Photographers already have their camera with the 5DIII or the 1DX so why even bother making this camera for photography?