Yeah, this was already sequeled in 1994 with Charles Grodin replacing Darin McGavin as The Old Man. The earth remained on its axis. There's plenty of Shepherd material out there, of course. I share your suspicion that this will be a sequel in the sense that it comes purely as a cinematic projection forward from the prior movie, rather than a further dip into Shepherd's memoirs. It's a funny thing that studios can do. They buy a property and they take it in their own direction. The Commitments had two sequels, but the producers who owned the characters wanted to do their own sequels. so the subsequent books of the family's continuing story, had to be filmed with new names and re-written characters of the family, while the studio hung on to the rights to the characters hoping to film a second movie about the band, which, of course, never happened. Similar with The Thin Man series I've been watching. Hammet only wrote one Nick and Nora Charles novel, but the studio milked those two freaks for all they were worth, and pounded out five more films. The Thin Man also shares The Pink Panther's penchant for absurd titling in sequels. The "thin man" of the title, like the "Pink Panther" is merely an element in the case in the first film. When the films became franchises, they had to continue to refer to the titles of the first, even though there is no "thin man" and no "pink panther" in the subsequent films. It's the brand, even if it's irrelevant. And in a strange way, Nick Charles becomes "The Thin Man" just as Clouseau becomes "The Pink Panther." I recommend you not see this film. Leastaways because Jean Shepherd isn't around to narrate it.