Metro: Last Light is supposed to be pretty scary, but what about actual story and characters and such? Those are pretty important. The latest trailer, dubbed "Redemption," sheds a bit more light on Artyom's background. Nothing specific, but we did get an idea that it's pretty awful.
The voice you hear belongs to Anna, the Order of Rangers' top sniper. She also happens to be their leader's daughter. It doesn't take a genius to guess that she's kind of a badass. Hell, I imagine being a lady down in the Metro doesn't leave her much choice.
As for Artyom, he's tasked with saving us all, in a world that seems to follow the bad ending for Metro 2033. No pressure, or anything.
Metro: Last Light will be out on May 14.