Shockwave is the best Galvatron figure ever made sans head! Of course then I'll be without an awesome Shockwave… hmmm. Very similar to the IDW Galvatron in alt mode (without all the spiky bits though).
Skyhammer also has a déjà vu vibe going on, I think it's the head mostly, totally makes me think of Tigerhawk.
Fully agree that these are the only two must haves of the DotM line though that red repaint Ratchet seen earlier and probably Leader class Ironhide are in there for me also (as well as a hopeful repaint/Takara DotM Sideswipe cuz I won't buy a figure that looks the colour of a prototype, Hasbro).