I had read somewhere a while back that Bungie was going to introduce the ability to mix and match different armor parts for when you customize the appearance of your multiplayer character. I just came across this screen shot where the nearest Spartan in the foreground has a unique helmet. The red Spartan that is jumping and firing in the upper left (with the Brute Shot) also seems to have a weird looking helmet. A preview of things to come?
UPDATE: There are actually quite a few screen shots of the new armor. You can browse through all of them in Bungie's Halo 3 screen shot slide viewer: link.
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