Yeah, I'm not entirely sold on it. It has some moments but it doesn't draw me in like some of the other MCU trailers did.
Their goal is to have movies in every possible genre, fully decoupling from the "superhero" thing. Avengers is their suprehero movie, Captain America 2 was Spy Thriller, Guardians a "space opera" (star wars), Daredevil is a crime thriller, Peggy Carter was a period piece, etc etc, Ant-man is going to be a Heist movie.
I think they recognize that not all movies will be as loved by all people, but they want as many nets in the water as possible, funneling everyone they can into the MCU, and once they are hooked, hopefully watching everything because of the interconnections.
Also, Ant-man was greenlit when the main avengers (and downey) contracts were still up in the air. In addition to having a big shared universe, I think they want to get a large stable of avengers, so pieces can be swapped in an out as needed.
Getting the Pym history, and Ant-man and Wasp created, while adding more characters to Civil War, means Ant-man can still be relevant to the bigger picture while being a smaller scale Heist movie set in its own corner.
I wouldnt be surprised if we end up seeing a young actor cast as Hank Pym in future seasons of Peggy Carter, having him work with Starks Dad, found shield, etc.
That's how I understand it as well.
I think they are combining Ant-Man into several practical applications, including as a way to tie in movie universe into Civil War / Stark Industries, etc.
In the end I get that there's a master plan now behind everything Marvel, I just don't really find Ant Man that appealing...but I've been wrong before. I might be a good watch. I'll definitely be seeing it.