UPDATE: Now officially released via Marvel's YouTube channel.
Back in the summer I was lucky enough to see the Marvel Studios panel at Comic Con, revved up in fine style by Tom Hiddleston and capped off perfectly by Joss Whedon.
The following video, which comes from the JARVIS app, plays out the big Whedon moment and then follows through with what amounts to the first teaser trailer for The Avengers: Age of Ultron.
[youtube]http://www.youtube.com/watch?v=J0gwkYyAxnQ[/youtube]Yes, that did show you Iron Man's helmet transformed into Ultron. No, that won't have been an accident.