I don't know, this was a late renewal compared with last season. I think they renewed the show for a second season right after the premiere!
My concern is that they get a fourth season. If they follow the events of the book chronologically and split book 3 in half, the big event of that book (aka "RW") happens in the second half. The producers have said that they really want to get to that point in the story. I hope they're able to tell the whole story, but that event would be major.