Well, I thought I had heard a rumour or quote that the Ninjago area was to be it's own world... But I could be mistaken, and thinking of Crux Prime...
Castle World will likely come soon, since they have the potential to have more launchers on Nexus Tower or Nimbus Station now; especially because they're moving at least one launcher to Nexus Tower. Just my theory.
1. I've heard dungeons, but I've also seen evidence on Locale of a Ninjago World or two. Some images deep in the files as well, I think...
2. Yes, very likely. Don't forget they actually promised it would be the gateway to new worlds.
@Steel: I'm pretty certain Power Miners isn't set to have its own world, the "Lava Rock Monsters" are just Maelstrom enemies. They might not show up at all... also, I think there's an underwater world that has been under deep, in-house testing based on/according to a few scarce resource files I've seen.
