We’re flawed because we want so much more. We’re ruined because we get these things and wish for what we had.
Bungie is not working on Halo 4, they can`t make another Halo game for ten years due to the publishing contract with Activision.
But more importantly not to many people liked ODST so why would 343i or Microsoft make another, I personally thought ODST was great, but most of the Halo fans say other wise.