Just to let you guys know, the Halo series isnt thrown out of the window yet, so there still is a chance to be a Halo 4. Just ask Frank himself. In a interview for one of them gaming magazines he said that there still is a chance. PLUS no one from Bungie EVER denied the fact there was going to be a Halo 4.
[Edited on 03.19.2008 12:28 PM PDT]
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NEVER will there be a Halo 4, Dink Bungie said Halo: Reach will be the last in the Halo series. [Edited on 11.27.2009 5:40 PM PST]