Synonyms for returning to the martial arts world were gambling tyrants, Dragon Tiger Sect, Jingwu Sect, washing up in the golden basin, Little Li Flying Dagger, God of Gamblers, Bandit Commander, One-armed Blade, Limp Hero, Roll Earth Again, and Rise Again.
I haven't heard anything definite. Maybe there's a chance, but it could also be that the story has reached a natural conclusion. We'll have to keep an eye out for official announcements.
I'm not sure. It could go either way. Sometimes characters come back in unexpected ways in manga. Maybe there'll be a twist that brings Gojo back into the story.