I'd like to join that question.
After Maxon removed their ProRender integration from R23+, they informed us that AMD will continue to develop it itself from now on and bring it back as a plugin, just as it's available for various other software platforms.
Unfortunately, nothing new has been heard or seen from AMD on this subject since then.
So will there actually be a ProRender support for Cinema 4D again or not?
And is there a schedule?