#1 Lighting.
#2 Adult theme.
#3 Classic actors like Lance Henriksen.
#4 The Melee Combat.
#5 Speed of the Alien.
#6 Pred Jump, and Vision modes, especially Thermal.
#7 Hints to classic comic books, the Numbering on the Aliens.
#8 The little things... the blips on the Predators hud, the shake of the Aliens mouth as it's about to bite, the sound of the motion tracker.
So many great things about this game, hard to make a list, just think in under 5-8 days we will be playing it, learning it, figuring out how each race plays... cannot ...cannot ...cannot wait...