Modern Warfare 3: Double XP is now.

Call of Duty: Modern Warfare 3 celebrates a double xp weekend and also released Content Collection 1 yesterday on the PlayStation Store.  The new content pack is the biggest in the franchises history.  Content Collection 1 features four new multiplayer/survival maps (Plaza, Liberation, Overwatch and Black Box), and two special ops missions (Black Ice and Negotiator).  The brand new DLC is 14.99.

[Source: PlayStation Blog]