I enjoyed the trailer and you get a glimpse at the new CG Hulk but I feel that the studio is holding out with it's big villain reveal.
I know that Loki is involved some how but he's always been the manipulator, a more hands off kind of guy when tackling Thor and the Avengers together and the Skrulls to me are nothing more than foot soldiers that need to be under the command of a greater force.
That's why I'm hoping that someone like THANOS might be the secret main villain in this movie since the Infinity Gauntlet was seen in Odin's trophy room in the THOR movie.
Now that would be awesome!!