The Wikipedia article references this page which says:
Douglas, Bamber and Hatch were talking about the current gap in the show and one of them said that the plan was to split the final season between 2008 and 2009, a lot of people laughed and thought it was a joke and that they were ripping sci-fi. But then Bamber said "no, really. That's the plan right now." and then the audience groaned. So he may have been adding to the "joke" but that was not the impression I got. He even went on to say that that is how Sci-Fi essentially gets two final seasons for the cost of one.