Well it's been taking forever for the season premiere, so unsurprising.
As a Warner production they didn't have a reason to keep it going and going, unlike CBS in-house productions Good Wife/Elementary/Hawaii Five-O/NCISLA/Blue Bloods
It's been dead obvious since the end of the previous season.
It's definitely going to be missed though, I love this show so much. I hope they do it justice and end it with a punch.