It has just been revealed that Monica Rambeau will appear in Disney+ WandaVision. During the Hall H panel, it was announced an adult Monica would join the show.
Teyonah Parris has been cast as the adult Monica Rambeau on WandaVision. It has not been revealed what role she will play, but, interestingly, Marvel has chosen this show to introduce her as an adult. Hopefully, they will give Monica her powers and make her into Spectrum, but we will have to wait and see how this develops.
This story is still developing so stay tuned for updates from Hall H.