The 3rd Patch is live for XCOM: Enemy Unknown on all systems.  A couple major issues have been fixed including the AI teleport bug and the defeat screen when beating the game.

For PC users, the Chris Kluwe hero unlock is now available. Chris (Twitter @ChrisWarcraft)beat Firaxis’ Garth DeAngelis (@gsdeangelis) in a head to head match and won.  His prize was being added to the game as a playable character.

Also included is the Second Wave addition for anyone who has beaten the game. Second Wave will enable players to unlock gameplay modifiers that will add more challenge and replayability. Players will have to start a new game to access these options.

Second Wave Advanced Gameplay Options

Damage Roulette: Weapons have a wider range of damage.
New Economy: Randomized council member funding.
Not Created Equally: Rookies will have random starting stats.
Hidden Potential: As a soldier is promoted, stats increase randomly.
Red Fog: Combat wounds will degrade the soldier’s mission stats.
Absolutely Critical: A flanking shot guarantees a critical hit.
The Greater Good: Psionics can only be learned from interrogating a psionic alien.
Marathon: The game takes considerably longer to complete.
Results Driven: A country offers less funding as its panic level increases.
High Stakes: Random rewards for stopping alien abductions.
Diminishing Returns: Increased cost of satellite construction.
More Than Human: The psionic gift is extremely rare.

If the player has finished the game on Impossible Mode, these four additional Second Wave features will be unlocked.

War Weariness: Funding goes down over time.
E-115: Elerium degrades over time.
Total Loss: Lose all soldier gear upon death.
Alternate Sources: The power source cost to build facilities increases dramatically.