Also just found this... two of the stars, Ashley Scott and Brad Beyer, have heard rumors that Jericho won't get a third season, but rather a big screen appearance:
Linky"We got here and caught win of a possible movie idea, which we thought was really good," said Scott, who played Emily Sullivan in the series. "I think Brad heard about it online the other day, and I just heard tonight, and I thought that would be really wonderful, wouldn't it? Kind of put a closing on it."
I would be curious to see what they set the movie around. Like Beyer said in the article, there's still a lot of story to tell... I would imagine it would have to do with more ASA troops moving into Jericho to reclaim their rebelling Major Beck & Co.
Or maybe it'll basically be an American Civil War II movie.