[DVD-o-matic] faster encoding with GPU?

Since creating DCPs takes so much time, I was really happy to see that OpenJPEG has plans to extend their encoder to use GPUs. This might be the cheapest way to speed up the encoding, but I still have no real numbers on what to expect in performance. The graphs I saw were difficult to compare to modern CPUs/GPUs. Will it be hard to implement the usage of both the CPU and the GPU for encoding? Am I silly for hoping this might be good value, or is it better/cheaper to get more CPUs? /Adam Klotblixt