PowerPC Future: GPUL2 and the 970
According to MacEdition, the GPUL2 is essentially the same architecture as the PPC 970, and that the Power5 derivative chip is a separate project. (MacEdition article).
Based on the timing of release, the GPUL2 would presumably be the processor to take Apple's computers to 3GHz by next year. If so, it may cast some doubts on this ambitious report.