More details were shared at IAAPA 2018 today for Epcot's new state of the art coaster:

Quote Originally Posted by Gabrielle Russon | Orlando Sentinel

... At Epcot this spring, construction crews also finished the largest concrete pour ever in the history of Walt Disney World for the foundation of the Guardians of the Galaxy ride, Chapek said in his update.

The indoor roller coaster opening in 2021 will be one of the longest in the world and the massive show building is big enough to contain four Spaceship Earths.

Unlike a traditional roller coaster where riders only stare straight ahead, the car will tilt and shift so people can see the action around them.
Quote Originally Posted by Disney Parks & Resorts

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According to Bob, building an adventure this big will require a ride system and ride vehicles unlike anything our guests have experienced before. What guests will encounter can best be described as a one-of-a-kind storytelling coaster that connects the adventure of a storyline with the thrills of a coaster.

“On most coasters, the vehicles point straight ahead throughout the ride,” Bob explained. “But on this attraction, each individual cab will be programmed to direct your eye to the story happening around you.

That means instead of whizzing by the action, you’ll be fully immersed in the story from the minute you launch.”
Video shared during the presentation show that the coaster will have multiple cars to a train, but each car (2 x 2 seats and shown above) will be able to rotate 360 degrees under the control of the ride program. So unlike Primeval Whirl or other spinning wild mouse coasters, the rotation will be controlled and timed to various show scenes and elements in the attraction.