· A dozen new maps to battle aliens
· Rescue soldiers in dropships shot down by aliens and retreat from battles
· New particle and sound effects for weapons
· Support for smoke and incendiary effects
· New skirmish options to save squads and respawn aliens
· Battlescape render speed dramatically improved
· Complete overhaul of the campaign system, so that alien activity changes depending on the player's actions
· New capabilities for the rendering engine, including bumpmapping, specular lighting, glowmapping, flare support, texture blending and more
· A new tactical overhead map
· Alien bases have been added and the player can mount an assault on them
· Support for crashed UFO missions
· Overhauls of the map editor
· Loads of new maps and new tiles for existing maps that are randomly generated
· New weapons
· New music and sound effects
· And loads of behind-the-scenes optimizations and tweaks for everything from the pathfinding to the user interface