I guess it is to be expected a 28mp, about 2/3 or 1 stop noise improvement, and maybe a 1 stop Dynamic range improvement especially in the high ISO range. An improved AF, maybe similar to the 7D, new small features found on the latest cameras, and maybe a 100% viewfinder. There is no doubt they will do all sort of video improvements too since they want to keep the good momentum in the video area.
BUT.... the FPS is the only area we might not see a big improvement since this is not what the camera is intended for. Can you imagine such a camera with 8FPS ? It will be a super camera, with highest image quality , together with good enough AF and FPS for most situations and users. I think that's why I voted for FPS, as it is what I believe it's weak point.
With no competition, we will never see something like this, but with strong competition we might see a good improvement. Sony translucent a33 and a55 as far as I know cost less than a 60D and they have 7FPS and 10FPS respectively. The new A77 is expected to cost similar to the 60D and is expected (reliable rumors) to have 24MP and 10FPS with very high ISO capabilities. If it is true that a cheap APS-C camera can do 10FPS with 24MP I guess Canon do need to improve FPS in most of their cameras. They need to take care about the new FF cameras from Sony which will compete with the 5DIII. Sony has no interest to limit specs on their cameras, they just need to show off big time to steal clients. I think a big weakness of Sony is some side-effects related with the translucent technology, but still, I am happy to see such a competition which hopefully should mean a better 5DIII