The Cell is worth watching purely for D'Onofrio's insanity, the J-Lo-is-your-slave moment, and the beautiful/creepy overall feel. You'd expect the sequel to try to deliver at least one of those elements, but no...see for yourself.
The official synopsis is:
The Cusp is a serial killer who kills his victims and then brings them back to life; over and over again; until they beg to die! Maya is a psychic investigator who gained her powers after a 1 year coma after she was the Cusp's first victim! Now the Cusp Killer is back and Maya has little time to do what she has never done before, go into the mind of a killer unprotected, and save his latest victim.
It will be out on June 23.