Post-apoc blog Quiet Earth managed to get a hold of the Day One trailer NBC used for upfronts last May.
The trailer, apparently consisting of temporary visual effects and music, was a bit surprising in the fact that the series seems to be more than just the post-apocalyptic tale DVR Life had been expecting. A female character in the trailer seems to have not only been through this already (I just want to save these people from suffering the way we did."), but has the power to choose who she wants to surround herself with on her second go-round ("I choose each and everyone of you.". An alien come to save planet earth from what-or-whoever destroyed her planet, perhaps?
Day One is set to premiere sometime after the Winter Olympics in early 2010 on NBC.