Is there a Call of Duty Modern Warfare 4

No Call of Duty Modern Warfare 4 game exists. There is, however, a Call of Duty 4: Modern Warfare and a Call of Duty: Modern Warfare 2. There are currently no plans by the Call of Duty publisher, Activision and its developers, Treyarch & Infinity Ward to make a Call of Duty: Modern Warfare 4.

As of now the next scheduled release of Call of Duty is Modern Warfare 3, which will be slated for a November 2011 release. There has been no news for an MW3 beta.