No idea, but it’s something to keep an eye on if Stallone wasn’t just riffing and he really meant it.
I can’t say I follow exactly where he’s going with that, but if Sylvester Stallone says he has another great idea in him for Rocky, hop to it.
It worked well for at least two Creed spinoff-sequels, and maybe even a third with or without Rocky.
It’s possible his comments to the audience, during a career retrospective talk with Didier Allouch (via Deadline), suggested a new fighter for Rocky to train in a new spinoff.