I think it will be a video camera of some sort.
Could be the next 5D3 also since the 5D2 was a very revolutionary video camera.
I work in TV in Los Angeles and the 5D2 was definitely a revolution. The high end stuff is mostly shot on RED and Alexa, but the Canons are used a lot on budget stuff. Several years ago, I worked the NBC rebrand (which is on TV about 100 times a night). Most of the cast from all the prime time shows were shot with the 5D2 and this was a very high profile, huge job.
In fact, I would say the 5D2 is much more revolutionary than the RED because it brought interchangeable lens HD to the masses. PLUS, it's the ONLY full frame video camera so it has that really sexy look.
So yeah, the 5D2 and 7D has made a huge impact on independent films and lower end broadcast stuff.
As for the people who discredit EOS lenses for high quality video, why would RED make an EOS mount specifically for the RED Epic? It's because you can get great results on EOS lenses that won't kill your budget.
99% of people cannot buy PL mount glass and Zeiss CP lenses are also really expensive. It's very nice to own a set of lenses that you can use at any time. PLs and Zeiss CPs are lenses you have to rent because of the price, so you can never just walk out the door and shoot something.
So for the rest of us, EOS is a great, affordable video lens option. And TONS of great videos have been made with EOS lenses in the last few years. Just look at Philip Bloom. He's not alone as there are many others who don't worry about prestige and just shoot with what they have.
If Canon is smart, they will come out with something more affordable, yet close to the RED and higher end Sonys in specs. Then, they would do really well. After all, 5Ds cost a lot more than Rebels, but I bet Canon makes a lot more revenue off the Rebels than the 5Ds because of sheer sales volume. I think that's what Canon should do. The 5D2 was a perfect example of decent camera that cut into the high end REDs because of a good price tag. Of course the RED is better, but the 5D2 is good enough in many instances.
Just fix the dreaded moire pattern, make it 422, add 1080 60p, a bit more detail in the video and I will be happy. That's not asking for a whole lot. Sony has already done it (minus the 422)