March of last year saw the release of Metro 2033, which many considered to be quite the hidden FPS gem. Based on a novel of the same name, the game takes place in post-apocalyptic Moscow, mostly inside the metro system where the protagonist was brought up. It has an interesting system whereby decent ammunition is considered as currency and used to buy things, so to survive one must use ammunition of a much lower quality.
During THQ’s financial results it was announced that a sequel is in the works, titled Metro: Last Light. We have no further information but that at the moment, unfortunately, but with a bit of gameplay tweaking it could be very good indeed.