Two unreleased zones for Diablo 4 were spotted in the localization strings of the Steam version. These can be found on SteamDB, a website that utilizes the Steam API to provide a plethora of information.
Diablo 4 on SteamDB Diablo 4 Now Available On Steam
Only two of the listed zones on SteamDB are not present in the current iteration of Diablo 4, these being Teganze Plains and Torajan Jungles. It is not the first time these zones have shown up in Diablo 4’s game files.
