I consider myself high on the purist/curmudgeon scale. I also resist getting my hopes up about anything. But this trailer makes me very hopeful. I'm not letting go of my skepticism, not after what happened in '99, but I'm not going to read anything and everything into a teaser trailer.I'd implore others to resist that urge also, for their own potential enjoyment.
As for 3D...I don't get the hype. I've seen a couple of movies in 3D some number of years ago. I don't feel as if it works well for me. Maybe I'll give Guardians of the Galaxy a shot in 3D this weekend to get another feel for it.