 Halo : Combat Evolved Anniversary was announced to the public with a trailer on June 6 , 2011 , at Microsoft 's annual E3 global media briefing , which closed with the teaser trailer for Halo 4 . Bonuses for preordering the game included a Master Chief Xbox 360 avatar costume and an exclusive Grunt Funeral skull , which toggles whether enemy Grunts explode upon death . During the Halo Universe panel at the 2011 San Diego Comic @-@ Con , a short trailer showcasing the animation used in the terminals with a narration by 343 Guilty Spark was shown to the fans . Microsoft launched the Halo Living Monument , consisting of a live @-@ action short and a website , to celebrate the launch of Combat Evolved Anniversary . 
