Earlier this morning, leaked promotional artwork for tie-in action figures for Thor and Rocket Raccoon in Avengers 4 was posted online showing both heroes wearing matching new outfits with a smaller image of Captain America wearing a similar outfit also included with the leak.
In addition to the costume change, it indicates many of the surviving heroes from the events of this year's Avengers: Infinity War will join together on a mysterious new mission but also suggests the sleek, futuristic uniforms have a common origin that may hint at the Avengers' secret weapon in defeating Thanos and reversing the devastating loss at the hands of the Mad Titan: Hank Pym and the Quantum Realm.
The new Avengers costumes resemble the outfits Pym constructed in order to venture into the Quantum Realm and rescue Janet Van Dyne in Ant-Man and The Wasp, worn by Pym himself as well as the film's antagonist Ghost. Earlier fan theories and reports had suggested the Quantum Realm would provide the centerpiece for the Avengers' strategy in their rematch against Thanos but it was unknown in what capacity. The new promotional artwork not only confirms the importance of Pym Tech in the upcoming film but also offers clues on how exactly the scientist's work may play role.
While Pym and his family were among those lost to Thanos' climactic snap at the end of Infinity War, Scott Lang was spared, albeit trapped within the Quantum Realm with no one to extract him. Given that Lang has since been seen in various set photos alongside Captain America and Iron Man, it's a sure bet that the size-changing superhero will escape back to Earth to help his fellow Avengers, though that rescue may perhaps take as long as five years. And while Lang is no scientist himself, his lack of high-tech savvy may not be a huge impediment in reverse-engineering Hank Pym's technology.
Previously seen in Ant-Man and The Wasp was an entire mobile lab able to join Pym and his associates in the Quantum Realm to give them a base of operations of sorts within the alternate dimension. Stuck in the Quantum Realm with him, Lang would presumably use the lab as a makeshift home and, upon his rescue, the lab would contain enough the technological means for Tony Stark, Bruce Banner and Shuri to decipher Pym's scientific advances.