It is unknown whether it would be a port or an entirely new game.
Blizzard
Jason Schreier, an industry insider and journalist, recently released his book on Blizzard's 30-year history, Play Nice: The Rise, Fall, and Future of Blizzard Entertainment. In the book, he revealed many facts related to the company's plans, including the development of the mobile version of Overwatch.
Schreier confirmed (via Dexerto) that Overwatch was led by Walter Kong, a General Manager at Blizzard, who "oversaw the release of regular heroes and content for Overwatch 2, as well as new projects like a mobile version of the franchise." There is not much detail yet, and it is unclear if the mobile Overwatch will be a port or a new game.
Bringing Overwatch to mobile was anticipated for some time. In August, there were rumors that Windows and Activision Blizzard planned to form a team to develop the studio's mobile games. The team would reportedly focus on developing AA titles inspired by existing Blizzard projects that were already available on PC and console.
Blizzard
Jason Schreier's book is based on interviews with more than 350 people, and thus, he presented an extensive overview of the company's long history. He also revealed that the StarCraft, Overwatch, and Diablo series could have had Netflix adaptations, but Blizzard sued Netflix for hiring away their employee. Also, Blizzard could have potentially become a creator of the most extensive digital store of PC games. Years before Steam's launch, several Blizzard programmers pitched the idea to turn Battle.net, a store for Blizzard games, into a digital store for PC games from different developers, but the company's leadership rejected the idea.
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