User blog comment:Harold Burned-Mane/My Theories on what will happen in The Elder Scrolls VI/@comment-5469467-20130911062400

I'm personally hoping that the next game will be set in Elsweyr, but Hammerfell would also be OK (though perhaps not as interesting). A desert setting would be quite a new move for the series.

If I may make one suggestion regarding your idea; by the events of Skyrim, the Mages Guild had collapsed. There would definitely be a magic-focused faction in the game, but probably not the Mages Guild. Maybe a local organization (akin to the College of Winterhold), but the Schools of Julianos (as seen in Daggerfall) would make the most sense. They have a page on UESP here.