[Update #2]: Pathfinder: Wrath of the Righteous' The Lord of Nothing DLC has added 15 new archetypes and a lengthy side-story to explore.
[Update]: After that brief delay, The Treasure of The Midnight Isles has now been unleashed!
The Treasure of The Midnight Isles is Pathfinder: Wrath of the Righteous upcoming DLC that will be playable as a part of the main game's campaign or as a standalone roguelike mode. As you might imagine given the whole 'roguelike' thing, The Treasure of The Midnight Isles will let you explore a vast array of builds and party compositions, acquire all sorts of magical items and consumables, fight against scores of old and new enemies, as well as slowly but surely uncover the secrets of the Abyss... and the treasures it holds!
If that sounds like your type of adventure, I'm afraid you're going to have to wait a little while longer before you can dive in. According to Owlcat Games' developer update, The Treasure of The Midnight Isles has now been pushed back from August 11th to August 30th.
"As we were testing and polishing it, we’ve realized that some parts of it could use more love (and demonic corruption), but we were running out of time to do it," explains the brief announcement. "So, after some consideration, we decided to move the release date. Your cursed ship will arrive to port on the 30th of August, and meanwhile we’ll scrub the deck, place more loot, and hide the nastiest monsters and traps in places where you least expect them."
Considering how the previous DLCs struggled under the weight of their bugs, I consider this delay to be a purely positive thing. After all, Pathfinder: Wrath of the Righteous and its insane number of spells and traits is the perfect playground for a roguelike adventure, so waiting a little bit longer to get a fully polished experience is a small price to pay in my eyes.
Once The Treasure of The Midnight Isles DLC goes live I'll make sure to let you know. Until then, I'll leave you with the brief trailer highlighting just what you can expect to see: