That's the beauty of this trailer; it doesn't reveal any answers and it raises so many questions. The problem with a lot of trailers in modern Hollywood is that so much plot is exposed in a 3 minute clip, it ends up taking away the suspense of the unknown.
I am very confident that this will be both a critical and financial success. Nolan's track record speaks for itself in both of these realms. And my goodness, look at the (known) cast: Matthew McConaghey, Anne Hathaway, Michael Caine, Casey Affleck, Jessica Chastain. We know what roles McConaghey and Caine will play, but where Hathaway, Affleck, and Chastain fit in is a mystery.
The unknown is why I am excited for Interstellar.