Just for the record this is my guess:
My guess is Canon is going to release a hybrid video/photo camera (or at least video priority) or high resolution cinema quality camera that uses an EF mount, BUT at the same time they're going to announce a new EF mount series. One that is targeted towards video, like lenses with power zoom. I bet that USM technology, the motor used in some lenses for AF, could also be added to the zoom; it would be quick, silent and be passive if older cameras don't support it. It would be named like "EF-Z" for its power-Zoom feature and be oriented towards serious videographers and cinematographers. They might also be able to borrow some of the optical fomulas from there video cameras and put it into an EF lens package(though pretty sure highly unlikely because of sensor size differences). This would all also answer the possible rumor about Canon's "photo and video department merge or working together."
If the above did happen I would consider that "historical".
Edit: I just realized that someone else had said something similar earlier on in this thread.
Not sure, but I believe that the optical elements that move during zooming are larger, heavier, move further, and move in more complex ways than do the focusing elements. If so, the very small and fast moving USM mechanisms might not be effective for moving the zooming elements in a large lens nor would zooming need to be done so quickly. Power zooming just wouldn't need USM type designs. Someone else may have better info.