Marvel has been releasing character renders for its upcoming MMO Marvel Heroes for some time now. Recently the company has stated that the core Avengers team will included alternate costumes based off of their film appearances.
Marvel Heroes is an action RPG featuring heroes from all over the Marvel universe for you to play as. In the game the main villain has been stated to be Doctor Doom up to his usual shenanigans with the cosmic cube. Though Doom is the primary antagonist it has been indicated that villains and story lines from not only the comics but animated series and films will be mined for content. The game will follow a free-to-play model with I assume micro-transactions but whether this will be a downloadable client or browser-based game is unknown at this time.
Source | Marvel