Although it is unclear whether or not these are the final designs that will make it into the game, the suits themselves are identified as "Stark Tech" suits and appear to enhance the abilities of Earth's Mightiest Heroes.
From the looks of it, the suits themselves seem to be heavily based on Stark's Repulsor Technology and also seem to be designed to play to the strengths of each Avenger; such as Hulk's gauntlets or Black Widow's goggles. Although we can't be certain what role these suits could play int he game's plot -- or even if they'll definitely appear in the game -- they appear to be designed to aid the heroes in a crucial battle of some sort.
The idea of Tony Stark using his advanced technology and genius-level intellect to create suits for his fellow Avengers isn't anything new to the Marvel Universe in comics or film. Most notably, in Avengers: Endgame, Stark designed the suits that allowed its wearer the ability to time travel via the Quantum Realm unscathed. Furthermore, Marvel's 2011 crossover event Fear Itself saw Tony Stark use magically enhanced Asgardian Uru metal to create special suits (and weapons) for earth's defenders.
Marvel's Avengers follows superfan Kamala Khan as she attempts to reassemble Earth's Mightiest heroes years after the team disbanded due to their failure to stop the tragic events that unfolded during A-day.
Developed by Crystal Dynamics and Square Enix, Marvel's Avengers features Nolan North as Iron Man, Troy Baker as Bruce Banner, Laura Bailey as Black Widow, Jeff Schine as Captain America, Travis Willingham as Thor and Sandra Saad as Kamala Khan. The game is scheduled to be released on May 15, 2020 for PlayStation 4, Xbox One, PC and Google Stadia.