2012

January

 * January 3: Halo: Primordium, the second novel in The Forerunner Saga, is released.
 * January 18: The first issue in the Invasion story arc of the Halo: Fall of Reach comic series is released.

February

 * February 15: The second issue of Halo: Fall of Reach - Invasion is released.

March

 * March 21: The third issue of Halo: Fall of Reach - Invasion is released.
 * March 31: Bungie.net ceases all updates to game statistics and player service records, transferring all record-keeping to Halo Waypoint.

April

 * April 18: The fourth and final issue of Halo: Fall of Reach - Invasion is released.

July

 * July 4: The hardcover collection of the Halo: Fall of Reach - Invasion series is released.

October

 * October 2: Halo: The Thursday War, the second novel in Kilo-Five Trilogy is released.
 * October 5: The premiere of Halo 4: Forward Unto Dawn is released.
 * October 17: The definitive hardcover of Halo: Fall of Reach, including Bootcamp, Covenant and Invasion, is released.
 * October 22: Halo 4: Original Soundtrack Volume 1 is released.

November

 * November 2: Awakening: The Art of Halo 4 is released.
 * November 6: Halo 4 is released.

December

 * December 4: Halo 4: Forward Unto Dawn is released on Blu-Ray and DVD.
 * December 10: The Crimson Map Pack for Halo 4 is released.