From what I understand this is an upscale of the 7DII sensor, and if so that's a shame. There was a rumour that they were going to use a Sony made sensor which would really have made a massive improvement in DR. The biggest issues here will be lens resolving power and PC/Mac processing power. We started to see lenses hot their resolving power when the 16MP DX sensors came out, when Nikon brought out the 36MP sensor that showed many more lenses up. Now they have the 24MP DX sensor many DX lenses are rubbish on it and they need good (read expensive) glass.
Diffraction limits get hit very early too, somewhere between f5.6 and f6.3 I think. Canon are marketing this very much as a niche camera, mainly landscape and studio, but I'm not convinced it will be a great landscape camera simply because the majority are shot at high f numbers such as f8, f11 etc ... of course the DoF on the new 11-24mm lens @ 11mm will be pretty decent
I've been toying with getting a D810 (or maybe a D800 used) as I mainly shoot landscapes, but diffraction is a real issue with that. Nikon are rumoured to be bring out a 50MP+ DSLR but I just couldn't get excited over it, now if it was medium format ...
No doubt there will be resolution a plenty though.
Sorry, didn't want to put a dampener on it - I'd wait to see what the 5DMkIV brings, I suspect that could have some game changing attributes.