The AR seems pretty standard, I would think that is or is similar to your starting weapon.
The Blue Pulsar Rifle thing seemed to pack a punch, I never saw a reload on any of the guns to know if there will be a plasma/battery system along with bullets or what.
The 'sniper' rifle looked good, since the sights were not up for the video I couldn't tell what the scoped vs non-scoped was like, or if there is a free scale or a set scale system of scoping.
Grenade Launcher is pretty sweet looking, and I also think it just need to be used better

. It rocked that Transport Vehicle pretty hard, didn't desimate it, but then I would be irritated with the vehicle

.
--Don't want to hide behind your squad's vehicles when this is in play lol.
Rocket Launcher we first see appears to be an anti-armor model, because the rocket itself moves extremely fast, limiting the ability for a pilot to dodge. Didn't see a tracking system there, but there are good and bad things that come of those anyways.
2nd Rocket Launcher is more of a standard battle model, can't see the effect it has on the ground or its splash damage effects, but should be on par with other games.
The 'Rocket Boots' effect looked pretty cool. Hopefully that is either an scaled enhancement you can apply to your boots (scaled as in it lasts longer the higher level enhancement you apply), or a skill that requires some leveling.
The Infared does look like its a special device you can carry, or a skill you have to invest in.
Rag Doll goodness.
Vehicles are pretty sweet, wish there was footage of how feasible it is to take one down.
I don't care for the 3rd person perspective (shouldn't matter), but it could be nice for some Xbox players, though there are some sight issues that would have to be resolved.