Right now, people are focusing a lot more on more cores and more efficient architectures. As the manufacturing process goes down, stock speeds will go up, as will oc capability likely. Also, CPUS are generally ahead of the game right now. A lot of games are GPU bottlenecked, normal activities are vastly exceeded by most modern computers, and only the most intensive video editing strains cpus. What is happening though is a merger between CPU and GPU, as NV always bragged how their GPU was 13x faster than the fastest Intel CPU, or something like that. CUDA and IGP are putting more and more stuff on that small little chip, or using it more in tangent with the GPU, and therefore I suspect we wont really see a vast GHz increase, atleast until more of a new technology replace CPU's.