Pulled the from a tv.com article on the front page:
It's looking like the show is going to end things with season 5. The cast seems to be ready for it, from the way this article talks. There are also changes I'm not too thrilled about - the look of the show is going to change, we're going to have less ensemble scenes, only 18 episodes as compared to the normal 22.
Sigh . . . I love this show, and I want it to go on for a few more seasons, but if they're gonna end it this season, I hope they don't screw it up with these changes.