We previously planned to bring two new Arenas to the game in the Eternity’s End content update: the Maldraxxus Coliseum and the Enigma Arena.
Upon further review, we’ve decided to devote more development time to make Enigma Arena as good as we expect it to be. This new Arena includes moving features, and we want to make sure we get it working right before release. While we’re very excited about it, we’re now planning to add it to the game in a subsequent content update, and not with the beginning of Season 3.
Maldraxxus Coliseum is still on track for release with Eternity’s End update.