I'm a little on-the-fence about the art style. On one hand, it's definitely better than Halo 4 and 5's look and feel, and yet it isn't quite the same as 1-3. It looks too plastic, like it's missing some grit. Maybe it's just because we haven't seen much UNSC.
Speaking of which, I hope there are marines in this game. I love the old, kinda run-down aesthetic of human technology in the older games (humanity was on its last leg), as well as the personality of the marines and humanity in general. That's halo to me.
Overall, I'm sure this game won't be bad, but it's still a far cry from the original trilogy, which I guess isn't really a bad thing.