Well, it is very likely that they'll keep sprint as a static ability, we'll have thruster capabilitys, so hopefully we'll see some zero-gee multiplayer, I'd like to see armour ability's refined, but not removed, AL should be removed, or at least keep first person view with no emp.
It does need to be kept changing, so it doesn't become static and stale like CoD's multiplayer has, although you could say, why change something that works, if something remains the same for to long, it stagnates, that's why each halo has altered the multiplayer, reach just took it a little too far too fast.
At least we didn't end up with the crysis 2 multiplayer, invisibility, harened armour and heat sensory with long periods between recharge and short reacharge times, reach at least didn't give out too much, you where very limited compared to the mistake of crysis 2.