Sequels
The original trilogy is the first in what Brandon Sanderson calls a "trilogy of trilogies." The second trilogy will be set in an urban setting, featuring modern technology. The sequel Mistborn: The Alloy of Law is not a start to the second trilogy but is rather a stand-alone short novel. However, Sanderson's announcement on August 1, 2012 to write a sequel to Mistborn: The Alloy of Law means it will not stay a stand-alone novel, but it will not necessarily turn into the second trilogy.
Read more about this topic: Mistborn Series