CB: Marvel Entertainment tweeted a new Ant-Man television spot today that features Sam Wilson/Falcon (Anthony Mackie). They quickly removed it from their timeline, but we were able to hunt it down.
At the 18-second mark of this international TV spot, you can see Falcon, in his Avengers: Age of Ultron costume, step into frame. What's he doing there? You'll just have to find out when the film opens later this month.