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Microsoft is currently investigating reports of Halo 4's apparent leak, a spokesman told Polygon.
Several images of the game discs, as well as dashboard photos featuring Halo 4 have been posted on NeoGAF; YouTube videos featuring any leaked content have also reportedly been removed.
"We have seen the reports of Halo 4 content being propped around the web and are working closely with our security teams and law enforcement to address the situation," said Joe DiMiero.
Halo 4 is currently scheduled for a release date of November 6th.