That's because back in February Blizzard added a bunch of damage around the map, including a smashed wall with the game's most recently released playable character, Orisa, being plastered to the wall at the point of impact. The current Doomfist, Ogundimu, is the third person to hold the Doomfist title.
"However, after recent events in Numbani, it can now be confirmed that what occurred was an attack by the Talon organization with the express objective of freeing one man: Akande Ogundimu, better known as Doomfist". After a few more teasing updates along the way, including the story of an attack at a Numbani airport, Overwatch finally revealed Orisa on March 2nd, even going so far as to put the hero in the Public Testing Realm (PTR).
In an Overwatch blog update on July 4, 2017, Blizzard once again teased the community about Doomfist, a character with ties to Talon. That said, Blizzard has effectively built up its world outside of the game, namely through animated shorts.
The report narrated that an unidentified aircraft approached the facility and passed through its defense systems without incident, most probably because the prison's technology was hacked by Sombra.
Video surveillance from within the compound showed a shadowy figure emerging from the unknown craft and proceeding through the prison grounds.
The report goes on to imply Reaper was responsible, and that Helix lost track of Ogundimu until the previous incident where the Adawe International Terminal OR15 defense robots were destroyed. The blog post states that Reaper freed the gauntlet user, leading to additional security breaches as well. Those little teasers have gained enough attention that actor Terry Crews has repeatedly asked to be cast as the character. This may just be all about revealing some other heroes instead. Overwatch has, however, also referenced a Doomfist character whom Blizzard has labeled "the Successor", and it's likely that's Akande Ogundimu.