Shown in the ESPN 2 broadcast of Capcom Cup 2016, Morrigan and Captain America are confirmed to be returning to fight in Marvel vs. Capcom Infinite. These MvC veterans are back to fight alongside newcomers Captain Marvel and Mega Man X, sporting similar movesets to previous MvC titles.
In the extended gameplay trailer, we see Captain America throwing out a Hyper Charging Star and Morrigan using her Darkness Illusion Hyper Combo, so expect to chuck shields and fire off Soul Fists sometime in 2017. There is also a glimpse of one of Mega Man X’s Hyper Combo, where he equips the First Armor from the original Megaman X. One can assume that this Hyper Combo will be similar to Arthur’s Golden Armor from Marvel vs. Capcom 3, with Mega Man X receiving either new moves or buffed stats thanks to this upgrade.
As for more information on the nitty gritty of Marvel vs. Capcom Infinite, make sure to watch this interview from the PlayStation Experience, with Mike Evans and Mike Jones from Capcom and Marvel Studios. According to the interview, Marvel vs. Capcom Infinite is to be the first title developed in-house at Capcom for over a decade, rather than being outsourced/co-developed with another company like Dimps or Eighting. With Capcom USA and Capcom Japan seemingly having full developmental control on Marvel vs. Capcom Infinite, this should ensure close developer support once MvCI is out there in the wild.
Sources: Marvel Entertainment