It would be really nice if they even reused some old stuff to implement various filler content.

8 man deep dungeons.

Duels at overworld.

Eureka/Bozja style actions and critical engagements in overworld.

Automated tournaments for PvP and Mahjong.

There's so many things they could throw at the game and see what sticks. You'd think with years worth of assets, they could whip up some prototypes to see player reaction.