From the footage we've seen, it actually looks like 5 doesn't have a very defined "utility" weapon". The BR obviously still looks pretty good, however it seems the pistol is also quite powerful. The AR up close looks like it completely shreds and the DMR seems to be the go to long distance rifle.
It looks like quite a refreshing change from the constant BR/DMR usage of 2 onwards.
Hey, maybe AR/SMG starts will be fun now?
You know, i used to think this. I used to think having an utility weapon was boring. I used to think having automatics only might be fun. Then i figured that losing was much, much worse. And well thought out and balanced sandbox of specialist weapons DOES GET USE, enough too. In theory anyway, in practices no Halo has been perfect (consider Halo CE and its Needler...).
A problem with "no utility weapon" approach is that we get a bunch of clone weapons, a la COD. Or Halo 4, where a single weapon is still the best almost everywhere (the DMR).
Having a single utility weapon would be boring though, i think, not a fan of Halo CE after all (except some principles behind it).
Having something like BR/Carbine/Suppressed SMG as a trinity-utility weapons might work, BR/SMG starts with Carbine as map-pickup alternative. (No idea where to put the pistol. Perhaps a power weapon, har har, i absolutely don't want a rifle-pistol like CE had unless we got all-out.) EDIT Unfortunately, i can't actually figure out how the suppressed SMG would work in this scenario. Can't see it being anymore useful than the BR, as it would naturally lack headshot bonus.
In this scenario, the AR would be a superb CQB weapon, as it is meant to be in theory, so your SMG/AR scenario works.
But i think Halo 4 must not be repeated (too many "utility" weapons, loadouts), nor should Halo go near COD either.
That's why the proposed hit to shields. It'd be less of a sprint, more of a toggle between speed and toughness. Maybe even up the jump height as well, just make it about mobility?
As i said, interesting concept for the Sprint. But i'm still not keen on it, don't think it is really needed.
(BTW, Crysis 2 did have something akin to this with its armor and cloak modes, the armor slowed you down, the cloak had other drawbacks though not very big IIRC.)