TVShowsonDVD.com has further information that there will be a Sports Night: The Complete Series — 10th Anniversary Edition released September 30, 2008 at the MSRP of $69.99. It will be an 8 disc affair with some extras like commentary tracks from Sorkin and Schlamme. More information here.
This is starting to sound less like a rumor and more like a reality. *crosses fingers*