Zones on 13 February 2009
The trailer was completely in-game, the only thing changed was the camera angel, and that was done to give a more cinematic feel to the trailer.
As for the red orbs...
"Gamepro: I didn’t see red experience orbs coming off enemies, is it just too early to show?
Stig: It’s just too early to show, expect all that to come back."
