I don't really need anything more than the 5DIII, but I'm going to start saving in case this has Sony-like DR. Instead of getting a new release 2-3 years after the release, this might just be one I get quickly.
Sony-like DR at base ISO (no banding etc...)
That would definitely be enough to get be buying quickly. Even with 22Mp and no 4k I'd jump on it.
that would be nice (other than short on reach a bit) and in another 3-4 years merge this with the 50MP and then wow!!