Major points:
- default zombies have:
--- no sprint
--- faster move speed
--- higher jump height
--- headshots enabled
--- a green energy sword
--- a stylized "infected" HUD (looks to be a static overlay)
--- a unique green armor color
--- an effect slightly reminiscent of the "pestilence" armor effect from Reach
- default alpha zombies have that plus weak active camo
- default survivors have AR/shotgun starts and can pick up weapons
- default "last squad standing" (1-? players) have infinite ammo and fast reload
- all of these can be changed in custom game options
- zombies don't seem to drop weapons, unsure about variability there
- 3 developer-made map variants at launch and an unknown number of community maps

How do I feel about this?