With appearances from Captain America, Iron Man, Black Panther, Black Widow, Hawkeye, Vision and Spider-Man, Civil War sounds more like Avengers 2.5...
Following the events of Age of Ultron, the collective governments of the world pass an act designed to regulate all superhuman activity. This polarizes opinion amongst the Avengers, causing two factions to side with Iron Man or Captain America, which causes an epic battle between former allies.
The epic Marvel fight begins shooting April 1st, with a release date in Summer 2016.
In his Facebook post revealing the poster, Downey Jr. writes,
Got a little somethin for ya, folks. Just cuz you’re awesome, check out this new Iron Man poster for Avengers: Age of Ultron. And don’t tell 'em I told you, but there’s a big announcement coming in 8 days… Shhhhhhh…What do you think the big announcement is?