Expanding for future games

So every sequential game needs some reworks or additions to feel new or just simply improve the series. With the move to a new company Halo 4 has seen some massive reworking in that there is now customization that affects your combat capability. This is good and all but I have a feeling this system of loadouts is here to stay for the rest of the series. What could 343 do to expand upon this system to keep things interesting in the future?

Examples could be new features like weapon or vehicle customization. They could also simple refine the current system a little bit. I expect to see a little more control over ordinance drops in future halos. Maybe they can add a air strike type thing as a related but separate system to ordinance drops? Seeing your enemies Mac blasted would be cool. Vehicle ordinance would also be cool for big team playlists. Would love to see pelicans flying into and out of the battlefield to drop off vehicles. Just thought this was an interesting topic that id like to hear other opinions on.

Also to keep constructive YES many other games do have some of these features like weapon customization and air strikes but one key to technological progress is to take what works out of others creations and implement them to further your own. I mean omg call of duty has a melee attack!? NOOOO! Halo is too much like COD! (Cod sux balls btw. If you want realism play battlefield instead)