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Just a heads up - in the second video, there's a scene that could be a tad spoilery about 'Avengers: Age of Ultron'.
This next animatic shows Tony Stark talking to his artificial intelligence construct - Jarvis. It also shows a much different version of the meeting between Loki and Stark.
(Note: A recent rumor says that the villain in 'Avengers: Age of Ultron' (2015) is actually an evolved, evil version of Jarvis. If you listen carefully to what Jarvis says in this clip, that rumor makes a lot of sense.)
Next up is a toe-to-toe battle between Loki and Iron Man aboard a speeding train.
Finally, check out the climactic 'Battle of New York'. If you look closely at the end, you'll see Janet Van Dyne (Wasp) assembling with the other Avengers.
I hope they include some of these scenes in future Marvel movies. Whaddya think?