According to a Gameinformer interview with Pete Hines The Elder Scrolls Legends is intended to be released only on platforms that allow cross-platform competition. This makes totally sense, as the game lives from the size and diversity of its player base. However, this does rule out the PS4 as Sony wouldn’t permit cross-platform play. Not even for Fortnite.
For me, who was just thinking about buying a new console, I believe I will get an X-Box One now. Too bad, but as a fan I don’t want to live without TESL on on my console.