Late Thursday evening, Lee Unkrich shared the following on his twitter:
Tomorrow is a big day that may determine the next four years of my life. Wish me luck.
The next day, he was likely pitching an idea or awaiting a decision on whether or not his next project would receive the greenlight. Well, it looks like things went fairly well, as on Friday he shared a tweet (that has since been taken down) that read, “Weekend: Relax. Monday: Get started on a new movie.”
As to what the film will be about and whether it will be an original film or a sequel, we haven’t got a clue.
The unannounced film will likely be in production for about four years, giving it a release date of sometime around 2015 or 2016.
Source: The Pixar Times