Robert the Bruce by Jack Whyte. US and UK release August 6, 2013.
"You don't really need to have read the original trilogy to enjoy this book. It stands all on its own, which is pretty neat. In the Acknowledgments at the front of the book, Brandon Sanderson says that he originally envisioned Mistborn as three trilogies - one in the past, present, and future. He clearly states that The Alloy of Law is not one of those trilogies, but a side project that grew up on its own." ~ Amazon Reviewer
The Alloy of Law - a new mistborn book
The Hero of Ages - book 3 in the mistborn series
Mistborn - book 1 in the mistborn series
In a Pit With a Lion on a Snowy Day
The Colour of Magic