Wow, a ray of sunshine! There's more cheer in that beam than you'll find in Metro: Last Light precursor, Metro 2033. The first game did bleak underground tunnels better than almost any other. The underground towns inhabited by survivors of the mutant apocalypse were especially memorable, packed full of characters and incidental detail. Weapon sellers haggled with mercenaries, old ladies cooed at each other in corners, burly blokes guffawed over baked bean tins of vodka and every so often you'd come across someone who'd seen the surface and returned alive. They'd stand still and stare into middle distance looking sadder than a badger in a washing machine.
The sequel looks as though it'll bring similar levels of detail to its outdoor environments, get a good look at them in these new screenshots. Click to see them full size.