The Deathwatch get access to the newer Primaris.... specifically the Librarian, Captain, Reivers, and Aggressors. You can't fit them into the Corvus, which is too bad, but that's OK. The Corvus is awesome as it is. I hope they don't raise the points on it. It's a more mobile Land Raider. Not quite as resilient, but doubles as a sort of Alpha Strike potential if it doesn't get blasted out of the sky by a billion lasguns.
I'm specifically going to try some Reivers and Aggressors eventually... or at least see how to squeeze them in. As it is, it's close to pointless to take a 5-man squad of Terminators, but rather splash them within the Kill Teams.... But doing so, removes Alpha Strike potential... other than Vanguards. Reivers might help shore that up.
-edit-
Oh. Looks like we get Redemptor Dreadnought now too