FYI, I kind of burned out for a while on writing Dungeon World content. Not on playing the game! I still really enjoy it. But I wanted to let some ideas brew. What would you personally like to see more of ... traditional fantasy or "out there" ideas? For instance, I have notes on The Yellow Tangle (swamp/jungle, ant men vs. jaguar knights vs. frogfolk vs. fungoids), and Return to Kazarak (back in time, dwarf mechs fighting demons from the abyss, kaiju-pacific-rim style), and Sticks and Stones (stone age, dinosaurs, megafauna, ancient aliens and/or dino-men).
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The "out there" ideas are definitely the most appealing. With any TTRPG, it's easy for a gaming group to fall into familiar patterns (Oh no! More orcs!) so concepts like Kazarak are great, since they mix up seemingly incompatible ideas into a playable framework that allows a group to take "the fiction" in entirely new directions.
So any of the ideas you suggest (Yellow Tangle, etc) sound great - for me the value of Plundergrounds is to show what's possible, and encourage DW players and GMs to shake things up a bit and get that Mole Machine rolling!