Kind of, the Noble armor has been in the game from day 1 and it's basically Carter's helmet, and the Mk V armor from Reach, which is fairly similar to Carter's armor but not exactly the same. You can see it in the link in the OP.
Yes please. The Reach pistol as an alternative to the magnum for Warzone would be fantastic - easily the best-feeling pistol I've seen in a shooter. That grenade launcher is a thing of wonders, too.