BlogMickey.com is reporting that a recent permit filing by Disney with the state of Florida indicates a large projection dome inside the Guardians of the Galaxy building. The contractor listed on the permit is Spitz Inc, a Pennsylvania based company specializing in the installation of planetariums and other dome based shows. The permit also has an expiration of June 30, 2020. While that date is not a gaurantee of project completion, it's noted here as being well before any public dates Disney has issued on the completion of this project. The official word from Disney is this project is opening in 2021.
Our full rumor tracker for the Guardians of the Galaxy attraction can be found here.