Mendicate Bias on 10 February 2010
The second video was already confirmed fake by both Bungie and IGN.
I was going to say the first video actually looks real but JaggedSac brought up a good point. None of the spartans in the teaser were wearing Mark V or VI armor so that would either mean its fake or that you can unlock that armor in the multiplayer. As of now I'm not sure but if it is real the animations and graphics look pretty impressive.
The definitive evidence that video games turn people into mass murderers
