I'm very, very happy (and surprised) that this great show will get a final season to finish up its story. Why not, Fox? They'll have a chance to shop 101 episodes into syndication.
I'm glad it'll be 13 episodes. That'll cut down on the filler and will most likely mean that the final season will run uninterrupted.
I saw that JJ Abrams was interviewed about the news. I'm surprised his reaction wasn't "Fringe? You mean it's still on?" He does tend to abandon TV shows after about a season.