Another way to look at this is the old chicken and egg debate. On the one hand, we have the Nikonians bragging about their high rez camera fro sometime, and some canonistas complaining that we can't get one to beat the resolution, along with higher DR and great high and low ISO. If Canon were sensitive to that line of reason, they may release sooner than later the high res camera, with lenses to follow, or concurrently.
Personally, I would be interested in a modest increase in MP (say 36 so so, maybe less), in a 5 D body, 1DX focus and light handling, 7 fps, dual CF cards, ~4K. And a winning lottery ticket.
Hope that the high res body is not a 1D style and price. That could place the camera close to $10K, rather see a 5D style and price closer to $4,000