There will be no big megapixel camera coming soon from Canon. It´s a joke.
First we see a entry level full frame camera.
Canon tested full frames with 26, 28, 30 and 40 megapixels in the last years, but decided against an put th 18 and 22 megapixel sensor on the market.
If you want to shoot landscapes use the 1 DS Mark III, it beats the D800E. Second choice for landscapes is the 5D Mark III.
If you have long lenses and want to shoot sports, action and wildlife get the 1D X.
If you dont want invest in longer lenses use the 1D Mark IV.
If you want a multipurpose camera for all (but in all not the best) get the 5D Mark III.
Concern if you talk about big megapixel cameras that the photographer is it who gets the shot. Most of the world famous photographers do their job with a 1 Ds Mark III and get outstanding pictures.