The big difference between Overwatch and Overwatch 2 will be the latter's PvE story campaign, which Blizzard says will be similar in length and scope to other AAA shooter campaigns. That said, since Blizzard revealed the game at BlizzCon 2019, details about the sequel have slowly but surely been surfacing, especially about this new story campaign. For example, we now know the campaign will unravel across the perspectives of multiple characters.
Of course, each hero will have a different perspective on what happened and what is happening, which will naturally add layers to the narrative. In fact, I wouldn't be surprised if we see some division among heroes via these varying different perspectives. Turmoil within is a pretty standard narrative tool after all.
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