Modern Warfare 3 PC content comes in May
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Content Collection 1 DLC will be available to PC players sometime in May.
The content is effectively the first set of content released as premium console content, Call of Duty: Elite. It includes multiplayer maps Piazza, Liberation, Overwatch and Black Box. You'll also see Spec Ops missions Black Ice and Negotiator.
We don't know when the next set will drop, we do expect to hear more in the next few weeks though.