Just now, at the end of Marvel's SDCC presentation, it was made official:
Brie Larson will play Captain Marvel. It's happening.
This is a wildly exciting development. Larson's long been rumored for the role, and all afternoon fans have been wondering if an announcement might be made... and if Larson might make an appearance during Marvel's Hall H presentation (she was, after all, already on-hand for Warner Bros.' Kong: Skull Island presentation).
Welp, they did, and she did, and here we are.
No further information at this time (beyond the announcement, all they revealed was the logo at the top of this page), but you can bet your candy ass that we'll be keeping you updated on this as developments occur. Celebrate with us in the comments below.