- FFMagee
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- Exalted Heroic Member
I would think by now that it would be a new engine. I know that Bungie stated that the ODST team was a very small group in comparison to other groups working on other "secret projects." I figure it's safe to assume that one of those project is Reach, and, considering that they've been working on it since around Fall 2007, it would be safe to assume that in the 3 years since Halo 3 they made a new engine for Reach.