I recall a Hasbro person at some point being quoted that they don't leave groups incomplete. It just seems to take some time!
I'd expect a Titan Scorponok will be come along, and a deluxe Repugnus.
I also believe the Dinobot and Terrorcon molds should also give us anough base molds for a set of Seacons and Pretender Monsters (possibly as box set exclusives like Computron and Liokaiser and probably with some compromises on the sixth member in each team).