Halo 4's base movement speed is a joke. In a game with practically nothing to mitigate the effectiveness of the core rifle over long ranges, and with aim assist that makes Halo 2 look like a PC shooter, 343i bizarrely basically didn't crank up the movement at all as compared with Reach (which already could have used faster movement). Resultantly, having map flow that is simultaneously functional and interesting in Halo 4 can be a rarity.

"But there's sprint!" Yeah, and you slow to a crawl when you get shot. And you can't shoot back while using it. And said sprint is probably part of why the base movement is too low in the first place.

Now that they're actually increasing the effectiveness of most weapons, not increasing movespeed would be questionable.

Faster movement and some decreases in aim assist to compensate for increased weapon power. It probably won't bring me back to Halo 4, but it's a decision that at least seems to be made in the context of other aspects of Halo 4's design, which is high praise compared with many of my other thoughts on the game. This kind of stuff should be encouraged*!

*Unless your goal is for 343i to descend down and down into making their very own Sonic 2006, resulting in a subsequent series revival into something resembling its past quality, but we're probably not that lucky.