The PPC 970 chip has been announced by IBM. It is expected to be released in 1.3 or 1.8 GHz versions, maybe this year, maybe next. Once it has been available for long enough that small orders like ours can be taken, people like Mai will be able to make some plug-in boards for them.
Meanwhile we have to put up with the poor, old-fashioned ordinary lightning-fast 800 MHz G4. Maybe one day we'll get the special "greased" lightning version.
tony