Rita and Swordsman, I think were the two that it was left kind of up in the air about. They may have been returning to their dead state as they 'flew off into the sunset', but, IIRC, *they took a Quinjet when they left* so that's an interesting trick...
If she ever did return, Rita teaming up with Janet would be interesting, given their very different personalities and life experiences. A very different 'Yellowjacket and the Wasp' pairing (and definitely one where Janet would be in the driver's seat).