According to Amazon, a remastered version of Call of Duty: Modern Warfare 2 is being released for Xbox One and PS4 on April 30. The pricing ($25) suggests that it will be a standalone release.
As with all listings of this kind, this may be a placeholder in case a game is announced. The listed release date would indicate an unusually small time between announcement and release – for comparison, the original Modern Warfare Remastered saw a six-month gap after being officially revealed.
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Source: [H]ardOCP – “Call of Duty: Modern Warfare 2 Remastered” Listing Spotted