there can only be new armor for ODST. not for Halo 3.
and before anyone starts flaming me for saying that, think about it.
sure, ODST is on the same engine, but if it were impossible for new armor available in ODST, then it would ALSO be impossible for new guns. and there ARE new guns.
besides, we've already seen four new helmet types. want proof? in firefight, you can customize your character. you can also use the different helmets that each member of the squad uses. those are new helmet perms. plus, Johnson is just a helmet perm that makes your head look like his.
but as for Halo 3, there will be no new armor.
just thought i'd get technical with it. have a nice day.