20 minutes of Dead Space 3 footage can be found below, some of which features commentary by executive producer Steve Papoutsis. The video gives a good feel for the new frozen environment, plus offers a look at new weapons, Necromorphs (including one that fills the screen), and the new co-op mode.
Some of this you may recognize from previously released E3 footage. While I'd pretty much written off the game as a Lost Planet rip-off at the time (funnily enough, Lost Planet 3 does still appear to be ripping off Dead Space), it looks at least somewhat more like its predecessors, if not as much as I'd like.
Anyhow, judge for yourself: