i agree i certainly think its a possibility the 5dmk2 is what made it for canon in the video scene sounds like the perfect venue to announce its successor i would say 75% chance we will see a 5d mk3 on november 3rd.On another site, I read someone's hands on review of the 1DX and he said he overheard two Canon employees hinting at the November announcement. The writer said that it would make a lot of people happy.
It's a Hollywood announcement. Maybe it's an X Mark I Electronic Clapperboard that will make a lot of 2nd ACs happy...
The 5D line does of course have some connection with hollywood though so both the high end videocam and it being annouced at the same time might not be impossible.
I'll bet you karma you won't see the successor then. I still think we'll see two dedicated video cameras. The lower end compatible with the EF lenses and 4:2:2. And the upper end 4k(fingers crossed) with PL lenses. Red Camera is announcing that day, so clearly Canon is trying to upstage them.