Amiga! 32 to 64....uuugghhh!
I read somewhere that it would work with 32bit OS's and only require some tweaks (and I think recompile) to go 64 bit. But someone else is sure to jump in with the answers. At least they are now calling the SIMD unit "Altivec" so it will be the same as the G4. And I'm not sure, but maybe the Artica P could be used for that, but likely it would have to be redesigned.