LA Daily News reports that X-Men executive producer Lauren Shuler Donner is currently working on the cast for a 4th installment in the movie franchise. Renegotiations would be needed to secure the main stars of the previous three films.

Donner says "The newer cast members are signed, and the older cast members are not." Considering the older names involved -- Halle Berry, Hugh Jackman, Rebecca Romijn, Famke Janssen and Anna Paquin -- that could run into a huge chunk of money.

All that's putting the cart before the wolverine, of course, since Hugh Jackman is set to reprise his role as the manicure-challenged mutant superhero in his own film. "Next, we're going to do 'Wolverine,' but not before the end of the year because he's in the Baz Luhrmann film," she says of the filmmaker's untitled Australian epic with Nicole Kidman. However, "We have the script and are working on it."

Shuler Donner reports, "We also have 'Young Magneto' in development."

Dont't forget to also check out: X-Men 4