Contracts have been reworked for a seventh season:
http://www.hollywoodreporter.com/liv...-season-744314
Talk is still that the seventh season will be the last. And from what I've been reading that's in part because they're cutting out tons of book five stuff this year. We'll see when book 6 hits the shelves, but I'm wondering if, in the end, the final couple of seasons of the show will actually be in any way related to the eventual conclusion of the book series. Not that the TV series can't be a fine thing on its own.