When the mini story pack DLC and the dungeon that comes with it was announced the devs said the new dungeon wasn’t going to be in the shard rotation.
If this ends up being the case, then the dungeon wont be much other than something you do once, or maybe farm for a bit if you can get transmogs in there. If you add it to the shard rotation however, it would be a dungeon you continue doing as a shard and it would give us another end-game dungeon to do.
For this to be possible tho there needs to obviously be a check so that someone who doesn’t have the DLC can’t get a shard for that dungeon. It should even require all of the party members to have the DLC for it to drop, otherwise you might be with a PUG that ends up getting a shard they can’t do because 1 or more of the people in the group doesn’t have the DLC.
I personally think it would be a waste not to have it in the shard rotation and it should be entirely doable.