Canon doesn't have a history of shooting themselves in the foot. In my opinion, if the c300 indicates anything, it's that Canon is going to be locked into this 4k-sensor-at-1080p-recording for the next couple of years. The Cinema EOS "4k" DSLR will most likely be the same -- "just" a c300 in a DSLR body, but without the audio/video features of the c300 -- and priced accordingly (somewhere between the highest-end DSLR and a c300.) Lame, I know, but I'm not expecting some miracle 4k recording (much less RAW) or some $3k DSLR-price point.
A c300-lite (fixed lens?) seems possible if you look at Canon's past, but who knows what they'll charge for it (probably more than you'd expect if the c300 is any indication).
As for Sony; I would love to see a 4k recording, non-RAW, s35 camera for $5000-7500 ready to shoot. That'd dominate the c300/Alexa and take a huge bite out of would-be Scarlet's customers as well. Unfortunately it'd also kill off the F3 pretty quick, so again, it's probably not likely... At least not at that price-point, and when you start getting into $10k+ area, you're probably better off getting a Scarlet (for digital cinema specifically).
With RED, as much as I'd like to see Dragon hit a clean base ISO of 12800, 1000fps/6k, and/or 15 stops of native DR (or something equally crazy), sometimes I think it'd serve them (and us) better if they focused even more on making Scarlet/Epic a little more bulletproof in the field. I'm not even talking about additional features (like the proposed pseudo-HDRx 4k on the SX), but basic functionality like phantom power or making black-shading less of an issue as it seems to be (I don't recall it being as much of a necessity with the R1mx.) It's hard to handle that stuff when you're attention is also focused on hammering out another completely new/revolutionary piece of tech (in this case Dragon), which promises to cure what ails ya.