Can anyone let me know about Veronica Mars Season 4?

There is a trailer for the fourth season a href="http://www.youtube.com/watch?v=LG_dqD9RrKMsort" rel="nofollow"http://www.youtube.com/watch?v=LG_dqD9Rr…/a of like a pitch for the network but it wasn't picked up so the last official episode was the season 3 final.