The lone wolf/lieutenant is confirmed to be a Spartan-III, which are weaker than Spartan-IIs.
PR
GameSpot
Since it's already been confirmed to be a FPS, I'm guessing it's like Gears in only tone. Although, maybe there will be a cover system and the camera will snap into 3rd-person, I doubt it though. I hope it's truly dark and violent given it's Reach. Halo games have been pretty kiddie with the violence, and I would like to see something more along the lines of the neill blomkamp shorts.