It would be nice to have a ranking system though. I find myself getting bored and having a difficult time finding something to do (especially if you've already beat all the campaigns) but I feel like having to rank up my character or profile would fill that Gap and give a little more to multiplayer
They did announce an new progression system similar to reach ( for unlocking these armors for example ) could guess it would be a copy of that ( i mean many asked for this for a long time like an xp system etc )
I would like some kind of new ranking system. Reach introduced the daily and weekly challenges which I loved. I hope it has those plus ranking. A combination of skill-based rank and XP rank would be cool. Just don't make us play the old Arena gametypes.
If the ranks just serves as a badge to remind players how much this guy has played, I wouldn't even consider the Halo Reach style ranks to be a necessary addition to the collection. Unless they make those ranks tie in with the EXP system like in Halo 3 (if they plan to implement that is), maybe I'd say it's a fine addition to the game.