Actually i think a possible scenario would be that Canon may want to draw a clearer distinction between the flagship 1D series from the mass market 5D series... so instead of introducing a full frame replacement to the 5D, it may instead introduce a 24MP APS-H (1.3x crop) sensor 6D. And future 1D models will all be full frame.
Because as it is now, there is really not much point shelling out so much for a 1D IV only to get a APS-H body, when one can get a high performance full frame body (5D) for a fraction of the price. So that in the future, if you want full frame, you need to pay to get a 1D.
LOL at your statement.
not much point selling 1d mk4 with aps-h body?
you might be surprised to know how many sports and wildlife photographers are using 1d body.
you might be even surprised to know how many nikon users wish they have aps-h body.