If rumours are correct, Canon are preparing a high MP camera later this year. The trouble is I have difficulty seeing which market they are going to go for:
1. 1D X price range with high MP
2. 5D Mark III price range.
If they opt for the latter, I can't see anyone buying a Mark III any more unless the Mark III had better noise or they limited the focus on the new High MP SLR, but then the Nikon would still be the best option. The biggest problem is the 5D Mark III noise and dynamic range, if they rocked on the Mark III, then there would be no worry but with virtually no improvement, what do Canon do?