It looks like we will have to wait for other details about the DLC, including a trailer and release date. According to the news posted on the site, Shadow of the Erdtree will be released on PlayStation 4, PlayStation 5, Xbox One, Xbox Series and PC (Steam).
Elden Ring was released on February 25 last year on PS4, PS5, Xbox One, Xbox Series and PC. It was recognized as the "Game of the Year" at The Game Awards and at the DICE Awards 2023. And its worldwide circulation reached 20 million copies.