Took some screenshots of some interesting things in the video:

What's this?


Spiker's back, though unless they change it's function greatly, it's kind of going against the idea that Bungie wanted to decrease weapon redundancy. The same reason they removed the SMG.
Also liking the new Brutes. The armour isn't so goddamn shiny now. Though I prefer the hairy Brutes from Halo 2 compared to these hairless ones.


Fuel Rod's back with what looks like it's 3rd major redesign. I would've though they'd have taken it out and have the Plasma Launcher replace it. Looks like they'll be appearing alongside each other.


And finally, it looks like we won't be the only one's given a wide range of armour abilities: