My vision, which will never happen, for AA7 is that it'll be the first game to feature some sort of mechanic that allows you to choose your character, so each case would have two routes that would each feature separate puzzles that eventually come to the same conclusion.
It also has a layton-esque world map instead of "move," gumshoe and maggey's kid as a sidekick for athena, sarge as the wright anything agency's "tech expert" and pearls finally getting that makeover.