I'm doing Tinker runs to scope out the subdungeon changes. So far:
Sir Thrawn's grave has been moved further back in the dungeon. This actually makes the dungeon even weaker, since it increases the minimum number of tiles you need to use to escape, leading to possible overkill if you really stomp Thrawn.
Sir Bradonnnn: A new pre-explored (ugh!) subdungeon where you can trade piety for benefits. There are three price points at 100, 50, and 20.
100: 3 compression scrolls, 1 health potion, 1 mana potion. Hilariously overcosted.
50: Dwarven gauntlets
20: Gold (not sure how much)
The middle reward might be worth the piety or the loss of exploration, but not both. The others are pretty bad trades.
Mass09 Banking: A shrouded (yay!) dungeon that gives you a small, reusable item that consumes one gold and randomly repositions all monsters on the map. Neat. You can locker it, and with a prep cost of 2, it might even be worth taking on almost-purist runs to smooth out bad luck.
The Paan Labyrinth: A very large, preshrouded dungeon with 3 lifestealing imps hiding in it. Potentially very powerful if you know how to manipulate lifesteal or you just need mana. The imps are placed randomly.