Writer and co-creator of the show Jon Favreau revealed that The Mandalorian season 4 has already been written. This means that the ending of The Mandalorian season 3, episode 8 was all intentionally placed to lead into future stories set in this sect of the Star Wars universe.
Lucasfilm has often reiterated its plan for a “Mandoverse” (our term, not theirs) of shows set during the New Republic era (five years after Return of the Jedi, in this case). It is all planned to happen after The Mandalorian Season 4.
We know it’s not the end for The Mandalorian! Showrunner Jon Favreau confirmed that he’s already written The Mandalorian season 4, mapping out a new adventure for Din and Grogu that we’ll presumably get to watch sometime after Ahsoka and Skeleton Crew but before the recently announced Mandoverse movie. And indeed, the finale leaves just enough plot threads dangling to set up a season 4.