Last I read there was speculation the release date would be announced this year, but that hasn't panned out yet. Next year at the earliest for the hardcover, if you're optimistic.
The last thing resembling "news" on the release date subject I have seen was some articles based on a Q&A with his editor back in late May, who basically said she has a hundred or so pages from Martin as of 2013, and that no release date has been set. Oh, and that there might be 8 books.
http://winteriscoming.net/2014/05/29...asonably-soon/