The first of the last three Wheel of Time books (books 12-14 were completed by Brandon Sanderson) now has a date set in the nice trade paperback format. The info is:ISBN - 10: 0765337835
ISBN - 13: 9780765337832
The release date is March 31, 2015. So keep that ISBN handy if you have the others in the trade paperback style. For reference (and newcomers), here are all the others books in the same format:
The next title to get info on is Towers of Midnight.