It seems like Matt Selman was a bit hesitant to divulge too many details, so we don’t have that much to go on.
“Who Shot Mr. Burns?” is arguably the biggest and best example of this, with recent years also delivering two-parters with “Warrin’ Priests” and “The Great Phatsby.”
But the details that do exist are exciting as all hell.
Some of The Simpsons’ most memorable episodes are the ones that draw from super-specific inspirations, whether it be specific movies, TV shows, historical events, etc. And for the idea to be spread across two different episodes is nearly unprecedented in this animated universe.