I’d be very surprised to see any further app content, but I do wish we had gotten a adventure option where it would randomly select a side quest, and give the players a choice of act and corresponding xp levels, like the competitive game’s epic play mode.

While we do have the two DLCs, neither of them really deliver a standard quest feeling.

I’d just like a quick way to introduce players to a standard app quest without playing Kindred Fire’s intro for the 10th time...

There's a decent chance of creating something like this in Valkyrie.

Tantum has already made a couple of one-off quests, without the difficulty level selection though:

https://boardgamegeek.com/thread/2334396/valkyrie-missions-city-dead-and-bow-your-king