http://terminalgamer.com/2010/01/27/halo-reach-3d-art-evolved/
A favorite insight of mine: “The AR (Assault Rifle) in Reach actually has more polygons than an entire Marine character did in Halo 3.” Despite working on a gutted Halo 3 engine, the assault rifle alone in Halo: Reach has more polygons than an entire marine from Halo 3, which means that the graphical improvements in Halo: Reach are certainly setting up to be astounding.
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Very interesting read for graphics whores and graphics prudes alike :)