The first official teaser for The Marvels was revealed by Marvel during a panel at D23 Expo, bringing

Brie Larson back to the MCU. Since this was done on an exclusive basis, here's a description:

In the exclusive teaser, Carol, Kamala and Monica are seen suddenly and mysteriously

switching places, quite reminiscent of the post-credits scene from Ms. Marvel's series.

Next, the three rummage around Kamala's family home, where

they try to figure out why they keep changing places. The preview 

also includes a small appearance by Nick Fury (Samuel L. Jackson).