Described in the video as "13,000 square feet of death-dealing extravagance", the trailer reveals the pitfalls of playing at such a high altitude.
Overwatch takes place atop an under-construction skyscraper in New York City. It features a restaurant, a penthouse and a "cornucopia of sniping nooks and crannies".
It is the third map released for Modern Warfare 3 Elite members, following the Liberation and Piazza maps released in January. Another two maps will arrive in March, followed by a single DLC map pack available to all users.
Each piece of DLC will first launch on Xbox Live, with availability on PlayStation 3 and PC following at a later time. The first two maps will be available on PlayStation 3 later this month.
Modern Warfare 3 will see a total of 20 updates over a period of nine months.
Call of Duty: Modern Warfare 3 was released in November and has broken Avatar's record as the fastest-selling piece of entertainment, but failed to topple Adele as the UK's best-selling entertainment property in 2011.
> Call of Duty: Modern Warfare 3 review
Scroll through images of the Modern Warfare 3 Overwatch map below: