In June 2008 Season 4 teaser commercials began running on FX with the date September 18, implying that Season 4 will begin on Thursday, September 18.
On July 15th, 2008, it was reported that FX has ordered 39 additional episodes of the series, on top of the 13 being developed for Season 4. Which, according to IGN, means that the show will run until a sixth season at least. All five main cast members were secured for the entire scheduled run. [4]
YAY!
__________________
"Moris should be here soon to rub it in my face..." -Pizza