Yes, but dunamancy is Mercer's baby and there is no precedent in the critrole game for a separate class existing. Liam's character, Caleb, is a wizard. Essik (the character who taught dunamantic spells to Caleb) is also probably a wizard. So I doubt Mercer would see the need for a separate class.He's not the only person working on this book. (I would not expect a full class either, but not because of who the lead author is).
And WotC doesn't really do full new classes much. They seem to be avoiding it, even.