Here's a more detailed plot. The character was thought to be dead but was actually in a different dimension. There, they were given a new name and a new purpose. When they come back to the Naruto world, they have to adapt to the changes that have occurred in their absence. They may have to team up with old friends and new allies to face a threat that is bigger than the village itself. They also struggle with whether to reveal their true identity or keep the new name as it represents a new start for them.
The information on whether the entire army would return after the attack was inconsistent. There were some articles and comments that suggested that the whole army might return, but there were also some articles that said that the possibility of returning was not high. Tianmei officials did not officially announce that the whole army would return or be permanently removed from the shelves. Therefore, it was currently uncertain whether the entire army would return.
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.