n Amiga-compatible PPC system already exists, called the Pegasos, and it runs MorphOS - an improved PPC AmigaOS without the Amiga name. It's still years ahead of the AmigaONE and OS4. It's also a lot cheaper.
Is it improved and years ahead, how can it be it uses similar hardware but difrent software till os4 comes out there is no way to compare the 2 machines even morphos in not complete and no one knows when the final full release is . :-? :-? :-)