I had the same suspicion, yes. Was about to ask if there will be more, then gift bag 4 was released, which I like very much.
I would like to see 1 or 2 additional skill trees... the bard, maybe? Or a succubus (with skills to both make enemy characters fight on your side as well as make them frightened)?
Or maybe even 1-2 new origin characters from the board game?
Or... and that would be my absolute favorite thing: NEW GAME PLUS.