From an interview with John Hight and Hazelnutty;
“The dungeons are a lot of fun…There’s a group of players that are really into it, but it hasn’t had as much broad appeal as some of the other features of the game. So we’re kind of taking a pass to see what the reception is like. If we get a lot of demand for more pet battle dungeons that’s something we’ll look at later [in the expansion (Shadowlands)].”
I don’t think there’s been enough of a demand for a new dungeon for them to take another look at making one, so I don’t think we’ll see one anytime soon. And based on Ion’s interview it seems like they’d rather take more of a look at improving pet pvp:
“Nothing huge for Dragonflight itself. Though, as always, we’re going to have a whole new array of stuff to tame, and capture, [and] incorporate in your collections, and outdoor challenges. Something I’d love for us to do is to take a crack at improving pvp pet battles.I think there’s room for an alternate mode there. Something that’s a bit more asynchronous, like where you set up a defensive team. Like a lot mobile games do stuff like this effectively. Like you set up your defensive team, and then you can instantly challenge other peoples. Right now, part of the challenge is just the critical mass of trying to queue up and go through the motions and find enough people. Even if we incentivize it like with the weekly quest, or whatever, it’s still pretty tough, and if you try it for the first time you’re jumping into the very deep end of a very shark-filled pool. Whereas I think there could be something much more accessible and fun there. I’d love to see us do it, but other things are taking priority for Dragonflight launch.”
At the end of the day, I’d like to see something in the style of the Celestial Tournament (which has had the most success of all the dungeons), and something that would create re-playability for said dungeon. Like rewards that would make it worth coming back to it even after the pets for said dungeon are collected.
The CT style is nice: 8 fights in a single location, set up in two sets of 4 to go in any order you want among the 4, with one set of four on a rotation of different fights. Plus, CT had a healer right outside the dungeon so if your free heal wasn’t up you could do that. With that in mind, you’d want a place that has a nice, iconic atmosphere in a single location. This means it doesn’t have to use a whole dungeon, and could include raids.