OS4 ownership is in a middle of a law suit so do not expect to see it on any PPC based machines for awhile, if ever. No, it will not run on your PC. If you want a native Amiga like OS, try
AROS. For a new PPC machine that will run (think it's not currently available to be purchased with MorphOS) Amiga like OSs in the next couple of months (Morph and AROS), look at
EFIKA.
Dammy
