As a surprise at San Diego Comic Con last week Paramount brought out Christopher Nolan who debuted the new trailer for Interstellar. Nearly exactly a week later that trailer has come online so now you can see what Hall H did.
While the previous trailer completely avoided spoiling anything from the third act of the film (aside from two quick shots), there’s a lot more in this trailer showing what they find on the other side of the wormhole. There’s also some evidence that changes have been made since the 2008 draft, as all those scenes in water in this trailer aren’t present in the original version of the script.
Still, aside from a couple things you really need to look for, the trailer is pretty spoiler-free.