Announced today at QuakeCon 2018, The Elder Scrolls: Legends is getting a Sheogorath-centric expansion called the Isle of Madness. While little is known at this point, mechanics probably include something to do with insanity.
The whims of the Daedric Prince are often interesting and enjoyable when he makes appearances in the Elder Scrolls universe, and the elements of his realm infused into the digital card game should be interesting.
Source: Game Informer The Elder Scrolls: Legends Focuses On Sheogorath For Next Expansion