Theory on Scarlet Witch/Civil War:
I think we've finally got confirmation of the catalyst for Civil War. Anyone who's familiar with the events in the comic knows that Nitro's actions, which include destroying an elementary school full of kids, were what kicked off the Superhero Registration Act debate.
In a previous trailer, Nick Fury tells a distraught-looking Tony Stark "the Maximoff girl is working you". We know Stark isn't too thrilled with the twins.
In this, and other trailers, we see Scarlet Witch on her knees, screaming as if she's going to unleash her power. In the most recent trailer, we catch a glimpse of this: http://i.imgur.com/FY9vFrs.jpg
There is a large part of the city being lifted into the air.
More proof: http://i.imgur.com/6enz8Sb.jpg
Any thoughts are welcome.