When NBC renewed the series last month, there was already talk that Dan Harmon will return for the fifth and potentially final season. It still has not been confirmed that this 13-episode season will be Community's last slate of episodes.
Dan Harmon was fired as showrunner last May by NBC, with the network hiring Moses Port and David Guarascio to take his place for Season 4. It was believed that Dan Harmon's supposed feud with star Chevy Chase was the reason for his exit last year, but now that the actor has left the series, that may have paved the way for the creator's return.
NBC hasn't announced when Community will return this season, although many speculate that the show will be back some time in midseason. Joel McHale, Danny Pudi, Yvette Nicole Brown, Alison Brie, Donald Glover, Gillian Jacobs, Ken Jeong, and Jim Rash star in the sitcom, that centers on a study group at a fictitious community college.