Well, if it's one dungeon per odd patch, all I can hope is that the one dungeon will have mechanically challenging/interesting boss fights. ARR 2.X dungeons had some very boring boss fights (most were just tank and spank with a mechanic that can usually be ignored), 3.X dungeons stepped things up a little bit (but Hullbreaker Isle will always be Dullmaker Aisle), but were still a little face-roll.

One thing I had been hoping for throughout the HW patches was dungeons having some RNG thrown into their paths. One run has you going one way and another run has you go a different way (a roulette within the dungeon), the two paths having different bosses.