According to this report, we might be getting an Overwatch 2 announcement at BlizzCon this year.
Hero talents and in-game items are coming to Overwatch 2 PvE, and one of the missions will be a four-player story experience set in Rio de Janeiro, as opposed to the 6v6 gameplay in the original Overwatch, according to the document. Blizzard did not respond to a request for comment.