No matter what the truth may be, we’re keeping our fingers crossed that all of this scuttlebutt might lead to the revelation that Sigourney Weaver will be joining the MCU in a role befitting of her stature as one of Hollywood’s best actors.
While it’s hard to pick out a specific role in Captain Marvel, the fact that Sigourney Weaver mentioned both the film and Brie Larson by name could indicate that there’s a part in that film with her name on it.
Still, at this point all we can do is speculate, with the hopes that next year’s San Diego Comic-Con will bring more definitive answers for the further actions of Phase 3 of the Marvel Cinematic Universe.