Not a ton. Sets up the basic premise and the general dynamic of the family. It shows some action-y stuff but it's all out of context. The one thing it does show is a (presumably) dead person's face, so if you want to go in knowing NOTHING nothing, I'd avoid it.
I remember enjoying it a ton at the time, just assumed it was bad like most things I liked back then haha
Chris Evans looks like he’ll be fun in this. This will be good to help the general audience not see him as Cap.