If you go to the official Interstellar site, you can enter in an access code to watch the newest, most space-filled Interstellar trailer yet. And because I'm more special than you but still want you to be my friend, I'll just tell you what that access code is. And, uh, here it is: 07201969. It also happens to be the date that man first landed on the moon, but that's probably just a silly coincidence. If you want to go into the movie knowing as little as possible, just ignore the trailer. If you're like me and have no self control, just watch it and take in the splendor. I'm pretty sure at one point my eyes glistened and a single tear rolled down my cheek containing all the hope and wonder of my childhood.
UPDATE: Here's a direct link to the video file in case you're into that kind of thing. Thanks to McGarnagle in the comments.