No, the renewal for 2008-09 is not official yet. But executives at NBC Universal are reported to be in search of multiple broadcast platforms for the critically acclaimed drama. The network has had conversations, to-date, with the CW, Comcast Entertainment Networks, DirecTV and TNT about sharing a window.
Personally, I'm hoping for a deal with TNT because they know drama ;) and their original series do well in the ratings.
Also, The Sarah Conner Chronicles is 29th in the rating?!?! And 15th in the golden 18-49 year old category?! So what's holding up FOX with a renewal? I know it's a pricey show to produce, but AI and House need some help sustaining the network.