I know it's going to be called Highprince of War, and that Sanderson plans to start writing it after he's finished the last Wheel of Time book. If that includes editing and such, then it should be sometime within the next few months, and maybe we could expect the book within the first half of 2013. He says he plans to write the third book immediately following the second, but then he might take a slight break to work on an Elantris sequel before he returns to Stormlight Archive. He says that he plans to do two Stormlight books every three years until it's finished, with one stand-alone book in between every two Stormlight books.

Oh, we're also supposed to see a book of his called Scribbler sometime in 2012, last I heard. It's a steampunk story with chalk-based magic, and is already finished.

He plans to write the next Mistborn trilogy at some point in the future. There's a third Mistborn trilogy off in the far future plans as well, along with a new series that to some extent ties all his other books together, to be written once Stormlight Archive is over. Dude's ambitious.