Yeah, the rest of the season will continue in January. If the rest of season 4 does well in the ratings SciFi may reopen talks with Henson about the show. As it stands now, the official Farscape site says they are working on a movie and a few other things to make the show continue.
Also, I was at the most recent NY Farscape Con and the 5 actors that were there were dissappointed that the show was cancelled. Claudia Black (Aeryn) seemed to be hit the hardest followed by Gigi Edgley (Chiana). Almost all of them spoke about the last day on the set and everyone said that if the show came back they would jump back on in a heartbeat.
The other actors that there were Wayne Pygram (Scorpius), Anthony Simcoe (Dargo) and Virginia Hey (Zhaan). They all spoke very highly of the show. They were all fun. *sigh *