Ok, if you have not seen the movie go see it. It was great! It had the usual non-believable super hero stuff but your kids and the kid in you will love the movie. And yes, there is a sneak peak at what's to come after the credits are complete. However, the movie was so long I had to go to the bathroom right after. I went to the bathroom when the credits started and got back in time to see the clip – btw, the credits are also amazingly long.
I don't know about anyone else but I wish I was as smart as Stack and I also wish I had that lab of his.