This is so good. So the rift seems to be because Cap won't give up (on)Bucky. That is so much better than the comic book version. The action sequence where Cap and TWS beat up Iron man looks sweet. I know whose side I'm on. Black panther is in there as well and so many others. Yet despite it all the trailer felt like a captain America story. This will be good.
I didn't look close enough to see if Ant-man was just too small to be obvious, but it seems they held the bug heroes out of the trailer. They'll be there though. They teased Ant-man in his post credits scene. I wouldn't think they'd back off that.
I like the idea of framing Bucky than the comic book version of media crazed New Warriors getting a bunch of school kids killed while never going back to blaming the media who forced them to fight in front of a school and the super villain who killed the kids. I am hoping they do have the Captain America speech to Spiderman, Luke Cage fighting for his home while Jessica and the baby escape, Daredevil giving Tony, the seven pieces of silver and Sue Storm. The last one probably won't happen, but damn I loved Sue in that story. With the introduction of a certain villain, I think they will keep the ending which murdered Marvel comics for most of their characters and me.
I do hope they change the ending, because Thanos is coming. I also can't see a Peter Parker joining the Avengers after what happens either. This does look great.