It’s pretty obvious really to anyone who pays attention.
It’s been clear for some time that development is winding down on the game: no further expansions announced, though not completely ruled out, and Zantai talking about storylines that are more a sequel than another expansion. We also know they’re working on a town builder game and Zantai said he was ramping up on another possible new project a little while ago.
We will get some more updates as Zantai said, but I doubt there’ll be any more expansions, new rogues, etc. Still there’s a new Grim Misadventure coming out next Monday so maybe we’ll find out more then.