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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well since 343 studios just confirmed another halo game......there will be