It's gonna be a trilogy and the first book, The Fool's Assassin, is scheduled for publication in August 2014.
Also. She'll be touring the UK and Sweden in late October/early November which is a nice change from the US/Australia/France routine, eh? :)
As always, see robinhobb.com for all details of the tour (or the confirmation about the book if you don't believe me :P) or you can bore yourself watching me trying to keep up with the news at theplenty.net