Eagle eyed users spotted three pictures used in the From the Vaults background on the Wizards website (scroll down to the From the Vault: Legends row). It is obviously still unofficial but it is sourced to Wizards.com itself so it would extremely surprising were it untrue. The image appears to show: Sharuum the Hegemon, Rafiq of the Many and Kiki-Jiki, Mirror Breaker with new art.

User RyanVespucci spotted it, and user RedC15 posted it on MTGSalvation with the image below.