Question: Which actors have signed up for Toy Story 4?
About the article "Toy Story 3", section "Possible sequel".

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According to an article on NOLA.com, "Toy Story 3" director Lee Unkrich has confirmed that a "Toy Story 4" sequel is not being planned.
"Well, we don't have any plans for "Toy Story 4"," Unkrich said.
"I'm flattered that people ask about it—it reminds me how much people love the characters, but it was really important to me with this film that we not just create another sequel, that it not just be another appendage coming off of the other two."
Unkrich went on to say, "there may be opportunities for Woody and Buzz in the future, but we don't have any plans for anything right now."
It has also been reported that Hanks and Allen have signed on for a "Toy Story 4" if Pixar ever decides to produce one.
In a BBC interview in 2011, Hanks said that he thought Pixar was working on a sequel.
Disney denied the rumors saying, "nothing is official."
According to an article on NOLA.com, "Toy Story 3" director Lee Unkrich has confirmed that "Toy Story 4" is not planned.
"Well, we don't have any plans for "Toy Story 4"," Unkrich said.
"I'm flattered that people ask about it—it reminds me how much people love the characters, but it was really important to me with this film that we not just create another sequel, that it not just be another appendage coming off of the other two."
However, he did say, "there may be opportunities for Woody and Buzz in the future, but we don't have any plans for anything right now."
It has also been reported that Hanks and Allen have signed on for a "Toy Story 4" if Pixar ever decides to produce one.
In a BBC interview in 2011, Hanks said that he thought Pixar was working on a sequel.
However, Disney has since denied these rumors saying, "Nothing is official". 
According to the terms of Pixar's initial seven-film deal with Disney, all characters created by Pixar for their films were owned by Disney.
Furthermore, Disney retained the rights to make sequels to any Pixar film, though Pixar retained the right of first refusal to work on these sequels.
In 2004, when the contentious negotiations between the two companies made a split appear likely, Michael Eisner, Disney chairman at the time, put plans in motion to produce "Toy Story 3" at a new Disney studio, Circle 7 Animation.
Tim Allen, the voice of Buzz Lightyear, indicated a willingness to return, even if Pixar was not on board.
In January 2006, Disney bought Pixar in a deal that put Pixar chiefs Edwin Catmull and John Lasseter in charge of all Disney Animation.
Shortly thereafter, Circle 7 Animation was shut down and its version of "Toy Story 3" was cancelled.
The character designs went into the Disney archives.
The following month, Disney CEO Robert Iger confirmed that Disney was in the process of transferring the production to Pixar.
John Lasseter, Andrew Stanton, Pete Docter, and Lee Unkrich visited the house where they first pitched "Toy Story" and came up with the story for the film over a weekend.
Stanton then wrote a treatment.
On February 8, 2007, Catmull announced "Toy Story 2"s co-director, Lee Unkrich, as the sole director of the film instead of John Lasseter (who was busy directing "Cars 2"), and Michael Arndt as screenwriter.
The release date was moved to 2010.
Unkrich said that he felt pressure to avoid creating "the first dud" for Pixar, since (as of 2010) all of Pixar's films had been critical and commercial successes.
During the initial development stages of the film, Pixar revisited their work from the original "Toy Story" and found that, although they could open the old computer files for the animated 3D models, error messages prevented them from editing the files.
This necessitated recreating the models from scratch.
To create the chaotic and complex junkyard scene near the film's end, more than a year and a half was invested on research and development to create the simulation systems required for the sequence.
Instead of sending Tom Hanks, Tim Allen and John Ratzenberger scripts for their consideration in reprising their roles, a complete story reel of the film was shown to the actors in a theater.
The reel was made up of moving storyboards with pre-recorded voices, sound effects, and music.
At the conclusion of the preview, the actors signed on to the film.
Dolby Laboratories announced that "Toy Story 3" would be the first film that will feature theatrical 7.1 surround sound.
Thus, even the Blu-ray version will feature original 7.1 audio, unlike other films which were remixed into 7.1 for Blu-ray. 
The film's first teaser trailer was released with "Up" in Disney Digital 3-D, on May 29, 2009.
On October 2, 2009, "Toy Story" and "Toy Story 2" were re-released as a double feature in Disney Digital 3-D.
The first full-length trailer was attached as an exclusive sneak peek and a first footage to the "Toy Story" double feature, on October 12, 2009.
A second teaser was released on February 10, 2010, followed by a second full-length trailer on February 11, and appeared in 3D showings of "Alice in Wonderland" and "How to Train Your Dragon".
On March 23, 2010, "Toy Story" was released on Blu-ray/DVD combo pack, which included a small feature of "The Story of "Toy Story 3"".
In addition, "Toy Story 2" was released on the same day in the same format, which had a small feature on the "Characters of "Toy Story 3"".
Mattel, Thinkway Toys, and Lego are among companies who produced toys to promote the film.
Fisher Price, a Mattel Company, has released "Toy Story 3" with twenty-one 3D images for viewing with the View-Master viewer.
Disney Interactive Studios also produced a video game based on the film, "", which was released for Microsoft Windows, Xbox 360, Wii, PlayStation 3, Nintendo DS, and PSP on June 15, 2010.
A PlayStation 2 version was released on October 30, 2010, as part of a PS2 bundle and separately on November 2, 2010 (the same day "Toy Story 3" was released on DVD and Blu-ray).
It was also the last Disney/Pixar game to be released on PlayStation 2.
"Toy Story 3" was featured in Apple's iPhone OS 4 Event on April 8, 2010, with Steve Jobs demonstrating a "Toy Story 3" themed iAd written in HTML5.
Pixar designed a commercial for the toy, Lots-O'-Huggin' Bear, and formatted it to appear as if it came from an old VCR recording.
The recording was altered with distorted sound, noise along the bottom of the screen, and flickering video, all designed to make it look like a converted recording from around 1983.
A Japanese version of the commercial was also released online, with the name "Lots-O'-Huggin Bear" replaced with "Little Hug-Hug Bear" (Japanese:ハグハグベアちゃん/"Hagu Hagu Beya-Chan").
On "Dancing with the Stars" May 11, 2010, episode, the Gipsy Kings performed a Spanish-language version of the song "You've Got a Friend in Me," which featured a paso doble dance choreographed by Cheryl Burke and Tony Dovolani.
Both the song and dance are featured in the film.
"Toy Story 3" was promoted with airings of the first and second film on several channels in the weeks preceding the film's release, including Disney Channel, Disney XD, and ABC Family.
Sneak peeks of "Toy Story 3" were also revealed, primarily on Disney Channel. 
  Actors - The 136 actors listed above have collectively delivered a total of 317 appearances in 82 Best Picture-winning films: * 1 actor appeared in 6 Best Pictures; * 2 actors appeared in 5 Best Pictures; * 2 actors appeared in 4 Best Pictures; * 35 actors appeared in 3 Best Pictures; and * 94 actors appeared in 2 Best Pictures.
Films - To date, 86 films have won the Academy Award for Best Picture, only three of which are not represented in the above list: * "West Side Story" (1961); * "Chicago" (2002); and * "Slumdog Millionaire" (2008).