At this point, there is not a whole lot of details about the upcoming Avengers game. We know that Crystal Dynamics will be behind the game and from the looks of it, they are not holding anything back from the game at all.
Starting from the staff, it was reported that Shaun Escayg, the creative director and writer for Uncharted: The Lost Legacy will be the creative director for the new Avengers game.
New reports are suggested that Crystal Dynamics has hired Stephen Barry to be the director of production for the Avengers game. Barry has worked on some major games like the Dead Space series in the past.
At this point, we still do not know when the game will be arriving. It might take years before we actually see something from Crystal Dynamics. Besides the Avengers game, they are also working on a new Tomb Raider game.