OMG!!! I am SO there!!!
I saw the teaser a few weeks ago at the theatre. It was great. A beautiful scene of the earth floating in space while they played "What a wonderful world", then with no warning... KABOOOOM! The Earth blows up and big chucks of rock come whizzing by you head and then the picture freezes and "DON'T PANIC" flashes up on the screen. My wife was like, "What the heck is this". You could tell who the geeks were in the audience cause most everybody was confused like my wife but there was like five of us going, "OH YEAH BABY!"
I hadn't even heard that they were making a movie before that.