From the video below you can assume:
#1- Hes a merc or military
#2- Hes a sniper and a damn good one to shoot from above the stratosphere above a planet
Reader Shell Kracker points out that the weapon spotted in the video looks an awful lot like the M-29 Incisor from Mass Effect 2's download pack.
Spike TV's Video Game Awards, which will air live on Dec. 11 at 8 p.m. eastern, 5 p.m. pacific, will also give viewers a preview of Batman: Arkham City, we're told. Stay tuned and until then, let's figure out what this Bioware game is.
[source: kotaku]