On Tuesday evening, the Xbox.com website showed a May 29 release date for the Halo 3: ODST add-on for Halo: The Master Chief Collection for the Xbox One. Today, Microsoft is backtracking on that date, saying it was a placeholder that was accidentally posted.
The admission came from the official Halo Twitter account today:
"A placeholder release date for the ODST campaign for Halo: The Master Chief Collection was inadvertently listed on the Xbox Store. We continue final testing and will make an official announcement once our release date is determined, and apologize for any confusion."
While Microsoft didn't flat out deny that the add-on would be released on Friday, it would seem unlikely this is happening. Halo 3: ODST will be made available for free for all owners of Halo: The Master Chief Collection who bought it before December 19, 2014, while a new Relic multiplayer map is coming for all owners of the game regardless of the date.
Thanks to HeyCori for the tip!
Source: Halo (Twitter)
