Le petit Nicolas is coming out in France on September 30. Germany gets it in January so it probably won't be released till next year for most other countries too... I believe the film is based on the popular and highly-acclaimed children's books by the same name. It's set in the 60's and is aimed at readers aged 8+ (which means c'est un peu difficile pour moi en ce moment!)
It reminds me a little of the film "Matilda" (based on the book by Roald Dahl). It looks sweet and funny!