IESB.net learned Michael Keaton will voice a Ken doll in the Pixar sequel Toy Story 3. The actor previously worked with the studio on Cars in 2006.

They got the inside information from Jodi Benson, who voiced “Tour Guide Barbie” in Toy Story 2 and will return for Barbie voice work for the third installment. She’s also the voice of the Ariel in Disney’s Little Mermaid prequel on DVD Tuesday.

Not much is known about the story yet, but a possible synopsis was given to the Wall Street Journal a few months ago. “Woody the cowboy and his toy-box friends are dumped in a day-care center after their owner, Andy, leaves for college.” The screenplay was written by Michael Arndt, whose first and only movie, Little Miss Sunshine, won him an Oscar.  Andrew Stanton (Finding Nemo, Wall-E) wrote the treatment.

Tom Hanks (Woody) and Tim Allen (Buzz Lightyear) will also return, among other cast members.

Toy Story 3 is scheduled for a 3D release on June 18, 2010.