Well, perhaps we should not get too worked up, given this is just speculation, but Canon seems to be hell-bent on alienating all their customers.
5d3 - crippled: deliberately soft video; omission of video specific and easy to implement firmware features such as focus peaking and zebra stripes; no clean HDMI out. Owners and potential buyers disappointed.
Canon C300 - released with a very hefty price tag, yet a cheaper 4k camera may be announced while C300 pre-orders are still being fulfilled. Owners potentially very, very annoyed.
4k camera - that this will be in an DSLR form factor seems bizarre. 4k is still currently a rather high-end format, requiring a lot of compute power in post. A dedicated video form factor would make a lot more sense.
And what's with the staggered announcements? 1DX announced in October, but not yet shipping. C300 announced in November, just shipping. 5D3 announced in March, shipping in March. And now we learn of yet another announcement scheduled for April. It just creates confusion.
This would make more sense: uncrippled 5d3 at current price (target audience - the one-man-band hybrid photo/videographer). C300 introduced at $8,000 (target audience - broadcast television professionals). 4k "C100" at $16,000 (target audience - cinematographers). And everything announced at the same time and presented as a coherent range of cameras complementing each other.