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Overwatch Hero Release Schedule Over Time
Ode to Overwatch: A Comparison between the Overwatch and Overwatch 2 Character Release Pattern
So OW2 is supposed to get a new hero every 18 weeks (every other season, one season being 9 weeks)
This means roughly 126 days between heroes following the OW2 cycle.
As for how it’s been:
Ana went live on 19 July 2016, 56 days after Overwatch went live with 21 heroes.
Sombra went live on 15 November 2016, 119 days after Ana.
Orisa went live on 21 March 2017, 126 days after Sombra.
Doomfist went live on 27 July 2017, 128 days after Orisa.
Moira went live on 16 November 2017, 112 days after Doomfist.
Brigitte went live on 20 March 2018, 124 days after Moira.
Wrecking Ball went live on 24 July 2018, 126 days after Brigitte.
Ashe went live on 13 November 2018, 112 days after Wrecking Ball.
Baptiste went live on 19 March 2019, 126 days after Ashe.
Sigma went live on 13 August 2019, 147 days after Baptiste.
Echo went live on 14 April 2020, 245 days after Sigma, and 165 days after BlizzCon 2019 as we missed a slot.