I think that I saw Carol in the new DC movie intro that played before WW (although I'm not 100% sure since some of the characters were harder to make out than others). I know that Atrocitus, Larfleeze, Jessica Cruz, etc were all there.
And given that Geoff Johns is going to have a lot of input in the films moving forward, I think that the chances that Carol shows up at some point are pretty good.
And since I HOPE that the new film will be much more spaced-based, you could definitely bring in the Star Sapphires in that setting.