EWOnline reports that Lauren Dern may return to JP3 with a cameo appearance.
The source also says that JP3 will be about a group of people who end up stranded on the island and must find a way to stay alive.
Also Screamve tells me that Alessandro Nivola (FACE/OFF) is in talks to play a graduate student.
And finally, it is rumored that Kathleen Turner will also join the cast.