Detroit rapper Eminem has been relatively tight-lipped about his upcoming eighth studio album, so it came as something of a surprise when a new single from the Eight Mile star surfaced Wednesday.  Titled "Survival," the song appeared on Eminem's official website as well as on YouTube in a trailer for the upcoming video game Call of Duty:  Ghosts, for which the song will also be included on its soundtrack.  The single features a female single whose identity is so far unknown.  Listen to "Survival" below.