I don't know what they're doing exactly, but they're done by now. Even if they would come out with some kind of competition to the new BMPCC 6K, the S1h or the incoming (I hope) a7sIII, they would just cripple it in some way that the others don't, for color science's sake. BMPCC fills so much tasks, from trad run&gun to streaming cameras, A7sii still reigns as the king of low light, and the S1h is basically everything a photographer/videographer has ever wished for. What's left for Canon in this segment? What could they get out of it?
I guess the only way they could profit from this segment now would be to release some kind of Amira shoulder-style docu/broadcast camera at a decent price. But they'll never do that.