They teased it in Blizzconline on Behind the Scenes of Overwatch 2 video and now you can see it for yourself in 1v1 limited duel. But for some reason you can’t explore or use the map in custom games since it cannot be found anywhere and is even removed from the list of maps for the 1v1 limited duel or mystery duel preset modes. But it still includes Ecopoint Antarctica and Castillo for some reason.
More detailed version:
