It's basically the same footage from all three trailers spliced together by movieclipsTRAILERS, but at least they decided to include a synopsis this time:
Bullock plays Dr. Ryan Stone, a brilliant medical engineer on her first shuttle mission, with veteran astronaut Matt Kowalsky (Clooney) in command of his last flight before retiring. But on a seemingly routine spacewalk, disaster strikes. The shuttle is destroyed, leaving Stone and Kowalsky completely alone—tethered to nothing but each other and spiraling out into the blackness.

The deafening silence tells them they have lost any link to Earth…and any chance for rescue. As fear turns to panic, every gulp of air eats away at what little oxygen is left.
Here's hoping that Alfonso Cuarón's thriller won't end up wondering aimlessly in cyberspace (just like Sandra Bullock and George Clooney). Gravity is set to release in the US on October 4th, 2013.