Already confirmed. I just saw the leaked footage and it looks awesome. More info in the HaloGAF community thread: http://www.neogaf.com/forum/showpost.php?p=138138013&postcount=16774.
That's actually some good shit. With proper cooldown and effectiveness, thrusters can add a skillful, tactical element to firefights with some emphasis on mindgames, all without overshadowing the core gameplay. It also opens up the possibilities for slightly more complicated traversal, and enemy designs with fast-moving projectiles that necessitate thruster dodging (and who doesn't love pressing a button to narrowly dodge a lethal projectile in any game?).
Silver linings, and all that.