September is when Captain Marvel‘s marketing will officially begin, and more and more signs are pointing to a trailer release. Many times a Marvel Studios teaser trailer is preceded by a cover feature in Entertainment Weekly.
Tonight, Brie Larson teased that Entertainment Weekly will break the internet tomorrow:
Hey @EW I’m bored. Wanna break the Internet tomorrow?
— Brie Larson (@brielarson) September 5, 2018
I don’t believe this is the trailer, but rather a cover feature with official images from Captain Marvel. If the EW cover arrives tomorrow, that means we’re looking at next week or the week after for a potential release date for the teaser.