GameStop describes it:
The epic clash between two storied universes returns with Marvel vs. Capcom: Infinite, the next era of the highly revered action-fighting game series. Marvel and Capcom universes collide like never before as iconic characters team up for action-packed player-versus-player combat. Marvel vs. Capcom: Infinite is currently in development and will simultaneously release on the PlayStation 4 computer entertainment system, Xbox One, and Windows PC worldwide on September 19, 2017.
Imagined and created through a shared vision between the two companies, Marvel vs. Capcom: Infinite will feature a variety of exciting and accessible single player modes and rich multi-player content for new players and longtime fans alike. In addition to single player Arcade, Training and Mission modes, a visually stunning and immersive cinematic Story Mode will put players at the center of both universes as they battle for survival against a sinister new threat, Ultron Sigma. Marvel vs. Capcom: Infinite is being built to highlight a combination of iconic locations and fan favorite characters from both universes, including Captain Marvel and Iron Man from the Marvel side, and Ryu and Mega Man X from Capcom.
(no spoilers on story)
(I wasn’t able to record gameplay because the demo would not allow it.)