Originally Posted by Wine-N-Cheese
I wouldn't hold my breath on this one. Pepper Potts only got a cameo in the first movie at the request of RDJ.
Pepper Potts is only a support character in the Iron Man mythos, though. War Machine became more than that, and a bona fide superhero with an actual membership card in the Avengers (Westies, anyway). Rhodey makes canonical sense in an Avengers flick; Pepper Potts doesn't.