I really like revisiting some of the old 2-sets, particularly with some interesting 4-sets floating around now like Prudence.

And bringing in the Fallen Fortress as a permanent dungeon is great too, that was a really cool-looking dungeon, particularly if there are achievements. Be good to see the Sea of Lost Souls return at some point in the future too. With the recent event grinding of most of the main Frontier dungeons, it'll be good to have some more variety.