The next superhero to come to Marvel's Avengers is Jane Foster, the Mighty Thor.
Crystal Dynamics announced this in a blog post. The character will “have a lot in common” with the existing Thor in the game, so it looks like a lot of moves will be inherited. Still, the character needs to have “elements that really suit Jane,” so it doesn’t look like it’s going to be a copy.
It’s not clear when Jane Foster will be coming to the game. The character is part of update 2.5, but that release date is still missing. More details should follow “in the future”. However, it seems likely that the character will make an appearance sometime this summer, as the new Marvel movie Thor: Love and Thunder comes releases in July.