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Not until Bungie releases a sequel to Halo 3. Halo Wars is a prequel; I don't know about Halo 3 ODST. halo 3 ODST takes place between halo 2 and halo 3 so no it wont be revealed in halo 3 ODST sorry....

Also, at the end of the Legendary Version of Halo 3 It shows master cheif in deep space. Then it shows a planet that obvioulsy has lights. You can see the cities on the planet from space. I am pretty sure their might be another one. =)