So. This news came in today: https://variety.com/2020/tv/news/gravity-falls-amphibia-alex-hirsch-disney-channel-first-look-1234699377/
Alex Hirsch wil reprise his role as Soos (now Frog Soos) and grunkle Stan (the curator) in a Gravity Falls homage in a new episode of the Disney Channel show Amphibia. It will premiere on 8th of August in the episode 'Wax Museum" (hey, why does that sounds familiar?).
Amphibia” creator and executive producer Matt Braly worked as a storyboard artist and director on “Gravity Falls,” for which he won an Annie Award.
In the “Amphibia” episode titled “Wax Museum,” the show’s family travels to a mysterious roadside oddities museum that looks and feels quite a bit like the Mystery Shack on “Gravity Falls.” Hirsch, who voiced Grunkle Stan on that show, will guest star as “The Curator,” a Stan-like character who owns the “Curiosity Hut” and features a frog custodian named “Frog Soos” (based, of course, on “Soos” from “Gravity Falls,” whom Hirsch also voiced).