The original helmet looked like a hazmat hood. That one looks like a more delicious Master Chief helmet. Which, I guess, isn’t really a bad thing…
EDIT: Upon a second look, that actually is a pretty good upgrade from the original. It has the same general style, but looks more protective, which makes a lot more sense. I mean, why have the body so fully protected in metal armor if your head is just wrapped in plastic? The new one gives a better sense of full-body protection.