It was an ill fated attempt to get the Amiga a POWER PC based motherboard to run os4 and beyond. A number of them were produced but a final version of Amiga 0s4 was never released.
Finally OS4 gets released.... but only for Amigas with phase 5 PPC Turboboards. Yes, you read correctly...
For whatever reasons current boards like the Sam440 or Efika are not allowed to run OS4.
The boarsd are no longer made and there is little hope of getting anymore PowePC based Amigas. But you never know, things can turn around.. Or not...
Such is the pace of the Amiga...
if you're ever sick in bed with a laptop and hours to kill, I suggest you google it and find the colorful story online.
