WARNING: Possible Spoilers For Avengers: Age Of Ultron Follow!
The biggest reveal from yesterday's "Marvel Event"? Hawkeye has a farm. That's right, at some point in Avengers: Age of Ultron, Earth's Mightiest Heroes (as they're dubbed by Captain America in the leaked clip below) end up hiding out there, something which likely happens after they get beaten by Ultron. His plans have something to do with the internet based on what we've heard in recent reports, so getting away from civilisation is probably high on their list of priorities.
What does this clip tell us about the film? Well, Thor has gone AWOL and Steve seems unhappy that his felow Avengers have been keeping secrets from him. "The Maximoff Twins" are clearly aligned either with Ultron or simply against The Avengers at this point too, while there's mention of the heroes all seeing something pretty unpleasant sounding as a result of the Scarlet Witch's powers. It appears as if Steve was the only one not to experience a bad vision (perhaps explaining where that WWII flashback featuring Peggy Carter fits into things), and it could be here that Tony has that hallucination of the team all lying prone on an asteroid - based on footage descriptions which came from this year's San Diego Comic-Con - with Cap's shield lying shattered.
That likely comes about as a result of Tony's fear of outer space following the events of The Avengers and how they left him mentally traumatised (as was evident in Iron Man 3). Unless of course the Scarlet Witch's reality altering powers gave him a glimpse of what's to come in Avengers: Infinity War! However, I'd bet it's more a case of them being shown thier darkest fears.
Something which can't be ignored is the tension between Captain America and Iron Man. As was evident in the first movie, these two don't see eye to eye, and you can easily imagine their very different stances on life playing a huge role when they clash in Captain America: Civil War even though they do seemingly put their differences aside by the end of this scene. Don't worry Cap, you'll soon be taking your frustrations out on Stark's face instead of just a piece of wood...