Despite speculation that the "big news" coming at a December 3 press conference would be the NASA Curiosity rover's discovery of evidence of martian life, the rover himself tweeted today that everybody should cool their rockets:
Everybody, chill. After careful analysis, there are no Martian organics in recent samples. Update Dec 3 go.nasa.gov/114tJs9
— Curiosity Rover (@MarsCuriosity) November 29, 2012
But in less anti-climactic space news today, NASA has discovered water, in the form of ice, on Mercury.