DMG Entertainment optioned the rights to the Cosmere, and they have been wonderful to work with. They commissioned screenplays for The Emperor's Soul, Mistborn, and The Way of Kings. They're currently in Step Three above, trying to get studio interest for the properties. Mostly, they've been pitching Mistborn as a film series and The Way of Kings as a television series.
Likely, the success of things like the new Lord of the Rings show and the Kingkiller Chronicles will influence how this goes in the future.