Toy Story 3 screenwriter Michael Arndt is all but confirmed to be writing the Untitled Pixar Movie That Takes You Inside the Mind.
IndieWIRE's The Playlist blog reported whispers of this when the film, set to open May 30, 2014, was announced this past Saturday.
After a fair bit of searching, I was able to find a post at Ain't It Cool News from April 2010 where Arndt casually mentioned: "I'm working on Pete Docter's next project at Pixar".
Pixar declined to comment "for now", but it's safe to assume things haven't changed and Arndt is still hard at work hammering out the script.
(Photo: Arndt in 2007 after winning his Original Screenplay Oscar for Little Miss Sunshine. Matt Petit/©A.M.P.A.S.)