It sounds like there will be enough to do a pure inquisition army, as the most recent wave stated "no Assassins in GK armies", but it still sounded like Assassins were in the codex. It does seem, though, that GKs really are the big focus of the codex, and as of yet there really hasn't been any talk of anything else, except the aforementioned Assassins, Inquisitors with psychic powers, and that Stormtroopers will fall in line with the IG ones.