It's been learned that a currently untitled Pixar feature is set for release in theatres on November 27, 2013. No details on its theme have been made public.
The news was first reported by Nikki Finke at Deadline Hollywood. Finke reports that "It's an original project, not a sequel."
While confirming the scheduling news, Pixar politely declined to comment further to me.
(Curiously, Pixar held a dinosaur-themed evening for employees in late April, which included a screening of Jurassic Park.)
It also wouldn't be surprising to see the release date later pushed to Summer 2014.