About 30 seconds of gameplay from the upcoming Dead Space 2 was just shown at PAX East during a panel discussion of the game. In it, Isaac flies through a few runaway train cars and zaps a necromorph.
If you want to see it, skip ahead to 23:50 of the video below. It's a somewhat shakycam that goes out of focus, but the gist of what you're seeing is intact. By the way, how badass is it that Isaac Clarke was a panelist in this discussion?