NowGamer supposedly spotted the posting, which has since been removed by Microsoft, but not before a mess of details were loosed. Among them: news that "Halo 4 is on the way."
A scene from the end of Halo 3 prefaces the news, which also teases "but that's not all." As we reported back in February, a Halo: Combat Evolved "remaster" is also apparently in the pipeline. The image says nothing beyond the game being "remastered for a new generation," and dubs it "Halo: Combat Evolved Anniversary" -- just in time for the ten year anniversary of Halo 1's original launch in November of 2001. We've reached out to Microsoft for comment, but we imagine we won't hear anything back until Microsoft's official presser in a few hours.