Quoted from 27dnast:
Gotta love these not so subtle hints. Ain’t gonna happen… this game is code complete and Spooky is moving forward. If any code gets released, it’s gonna be minor changes.
I unfortunately agree here. While Spooky initially indicated that additional content could be added indefinitely (as new "classic" episodes were released) it seems as though the relationship with the licensor fell apart when Adult Swim (or Cartoon Network...don't quite know the dynamics here) changed ownership/management (again, I don't know the exact logistics here). It's a real shame because it's such a great game, and more content would be awesome, but at least it is great as is.