I still can't decide on what I think everything is. I can vaguely make out some sort of damaged surface and a light at the far right. After I looked closer, I'm thinking that it is something on the Moon. Maybe something has crashed into the rocky ground, a meteor for example? The light looks like the one above the Bio-Dome's doors as well, so a meteor may have crashed into the Bio-Dome. That's just my take on it.
As for the sound, it almost speaks for itself: Power On. At first though I could have sworn it was something slowly getting closer to something else, like the meteor crashing or even the rockets hitting the Earth. Since the video says .wav, Treyarch clearly want us to focus on what we can hear.
I'm taking a guess and saying that we might get some more of these videos either daily or every couple of days, along with the Zombie Maps 101.