Halo should take a note of what Destiny does. It has a comp and casual Playlist but with no difference in gameplay mechanics. Only difference is the rewards you earn and game modes being played.
Are the Sabre and Seraph just props, for show, or could you actually fly them? Same for the phantom and pelican?
And I noticed they added the front gun variation of the falcon into the game. Hope you can get into the passenger seats as well.