I think that it's obvious after reading this novel it was defo a setup to more. However, after reading what the next two books are about, I can't help but wonder that atleast some of the issues won't be adressed in those two, and with the fourth novel being a Titan novel, I doubt that one will deal with some of the setups from R&D. So perhaps Peaceable Kingdoms then, otherwise it will be a looooooong wait.
Other then that, I suppose all I can really say is, for me personally, DRGIII did it again!!