According to the THE HOLLYWOOD REPORTER [1], Chris McCoy and Jan Pinkava are writing the animated film LITTLE WHITE LIE. The project as Laika Entertainment, which was behind CORALINE, is also being directed by Pinkava who came up with the original idea.
Pinkava has previously worked on the Pixar movies RATATOUILLE, MONSTERS, INC., TOY STORY 2 and A BUG'S LIFE.
Links:
[1] http://www.hollywoodreporter.com/hr/content_display/film/news/e3i9384d92ba8c3b4bda6d769399a15622e