Sanderson says that he's been working on this project for several years at this point, but it isn't based on any of his properties.
Did I miss an announcement? Why is Mistborn in the “Page to Screen
Author Brandon Sanderson had one more surprise for fans up his
The Lost Metal: The Mistborn Saga, 7: Sanderson, Brandon
Elden Ring Publisher Bandai Namco Interested In Collaborating With
Elden Ring' Creators Want 'Mistborn' Author Brandon Sanderson For
Brandon Sanderson Is Your God
Sanderson Video game hype : r/brandonsanderson
Brandon Sanderson's Mistborn Books In Order: How To Read Them
Elden Ring publisher wants to collab with Mistborn author
Arcanum Unbounded: The Cosmere Collection by Brandon Sanderson
The Bands of Mourning (Mistborn, #6) by Brandon Sanderson
Mistborn (The Mistborn Saga, 1): 9780765377135
George R.R. Martin Doesn't Deserve Elden Ring, Mistborn Author Says
How long does it take to catch up with cosmere? : r/brandonsanderson
Brandon Sanderson's Cosmere Reading Order