I would not realistically expect it before mid-to-late 2015 at the earliest. GRRM just started working on it in earnest last month and anticipates it taking at least 3-3.5 years. We do have THE WORLD OF ICE AND FIRE companion book (tentatively scheduled for this October) and a collection of the first four Dunk 'n' Egg prequel novellas coming out next year as stopgaps, however.
I also notice the Kindle edition is more expensive. What a great incentive to save resources, paper and transport...and to buy a Kindle for those who don't have one already. It's ridiculous that something that exists only in data form should cost more than a physical object.
I wish they had been clearer about that! I had pre-ordered it before reading the blurb, and then i realised it all sounded familiar! So in short if you shelled out the £15 to pre-order this in early 2011, or the £12.99 since then , YOU SHOULD NOT ORDER A Dance with Dragons (2) -AFTER THE FEAST-- because your book already has that material in it.
I myself was really excited when amazon sent an email to say that this book was coming out so I pre ordered it. This is the same book I bought July last year only a different colour, if you look at the chapter index they are identicle, hopefully amazon have given me a full refund, so dissapointed!