Nothing is officially confirmed, it's mostly just talk at the moment. The cast and crew of Farscape all want to do a feature film. They are also still attempting to find a network that might take the risk on a 5th season. And ADV Films, the company that puts the episodes out on DVD, is looking into creating a Farscape Anime series. I'm not sure where to direct you for info though.
MTFBWY and HH!!
Jar Jar Binks