In a video announcing that the Toy Story/Toy Story 2 3D double feature release in theaters now has been extended beyond the original two weeks, Toy Story 3 director Lee Unkrich also stated that Flight of the Conchords star Kristen Schaal will voice a new character in Toy Story 3, but the director wouldn't reveal details about the character.
Blake Clark will voice for Slinky, taking over for Jim Varney, who passed away in 2000.
Opening in theaters on June 18, 2010, Toy Story 3 features the voices of Tom Hanks, Tim Allen, Joan Cusack, Don Rickles, Wallace Shawn, Estelle Harris, John Ratzenberger, Ned Beatty, Michael Keaton, Timothy Dalton, Jeff Garlin, Bonnie Hunt, Whoopi Goldberg and John Morris.
Toy Story 3 was released June 18th, 2010 and stars Tom Hanks, Tim Allen, Joan Cusack, Ned Beatty, Don Rickles, Michael Keaton, Wallace Shawn, John Ratzenberger. The film is directed by Lee Unkrich.
Sources: Lee Unkrich