Apple TV acquires rights to the Cosmere! From The Hollywood Reporter:

The streaming giant has closed what has been described as an unprecedented deal to land the rights to the Cosmere books, the fictional literary universe by fantasy author Brandon Sanderson.

This lines up with what Brandon has said before: Mistborn as a feature, hopefully a theatrical release, and Stormlight as a series. Also:

Sanderson will be the architect of the universe, will write, produce and consult, and have approvals. That’s a level of involvement that not even J.K. Rowling or George R.R. Martin enjoy.