Disney confirmed yesterday that Guardians of the Galaxy Cosmic Rewind will open in 2022 at EPCOT. Disney did not offer a specific opening date.
In the announcement, Imagineer Zach Riddley said –
Guardians of the Galaxy: Cosmic Rewind, will debut in 2022. That’s right, our friends from Xandar will open the first ‘other-world’ showcase pavilion at EPCOT next year, inviting us on an intergalactic chase through space and time!

Here you see Imagineers Tom Fitzgerald and Scott Drake in the Galaxarium, which when completed will feature a planetarium-type presentation where the Xandarians show us their world, their people and their advanced technologies.
The new attraction will feature an innovation that we have not seen from Walt Disney Imagineering – a storytelling coaster that rotates 360 degrees to focus guests on the action, including the first reverse launch on a Disney coaster.