Might be reading into things a lot, but Ast's effect sounded a little like a 'winding up' speed effect effect, and I know that's the sound of the action itself because right after that we can hear a distinct eastern bell sound effect for the Hellfrog Medium upgrade.

So very likely we get the rest of the aspected summons for SMN! I just can't see they adding just Ramuh and leaving the Ice and Water elements out. Also the SMN doesn't have the pet out... might be just for Dawntrail, but I wonder if they truly ended making the carbuncle optional at this point.