During the events of the Avengers: Age of Ultron, after Wanda has played with the main Avengers minds, they end up in Hawkeye's safehouse to regroup. In the yard, Cap and Iron Man are having the following discussion, while chopping woods.
Steve Rogers: Sometimes my teammates don't tell me things. I was kind of hoping Thor would be the exception.
Tony Stark: Yeah, give him time. We don't know what the Maximoff kid showed him.
Steve Rogers: "Earth's Mightiest Heroes." Pulled us apart like cotton candy.
Tony Stark: Seems like you walked away all right.
Steve Rogers: Is that a problem?
Tony Stark: I don't trust a guy without a dark side. Call me old fashioned.
Steve Rogers: Well let's just say you haven't seen it yet.
Is Cap's last line, reference to the events of Civil War that will follow?