Size/Scale of other players.

I was just wondering if anyone had any insight as to the size and scale of other players in MM?

The “leaked” Gameinformer pics as well as the “First Look” Vidoc made them look similar to the size they were in Halo 3. But the Conan footage and the new Wal*Mart footage make them look similar to the size they are in Reach. Maybe a head taller though. Any thoughts?