I'd prefer not to see a relentless dungeon crawler followup like The Answer. The Answer was alright but suffered significantly from removing the non-dungeon crawler aspects of the main game.

What would I like to see? I don't know. New social links and new locations/available after school activities seems to be the standard and that works fine for me. It might be nice to balance some extra social links with more ability to spend time during some of the long stretches of story sequences spanning multiple calendar days, which harm the pacing of P5 a bit.