With no announced plans or intentions to film new episodes coming from anyone associated with Gilmore Girls, I think we can safely say we’re probably not going to be surprised at the announcement of more Gilmore Girls coming after Season 1 of The Marvelous Mrs. Maisel has been completed, if at all.
Obviously, having two shows in production at the same time is not easy, so it would all fall down to scheduling production for more Gilmore Girls episodes either before production begins on Mrs. Maisel or between that show’s two seasons.
Right now, Amy Sherman-Palladino’s new series The Marvelous Mrs. Maisel has been greenlit for two seasons at Amazon.
But, that’s only if the series doesn’t jump immediately into production for Season 2, which isn’t common, but would really depend on the series and what Amazon wants in terms of release.