Christopher Nolans' next on World War II?

Ace director Christopher Nolan next project will reportedly be about the Second World War.
The film already has a release date that is July 21, 2017, but details about the project are scarce.
It will be a World War II film based on Operation Dynamo, which was a near-miraculous evacuation of the British Expeditionary Force (BEF) and other Allied troops from the French seaport of Dunkirk which took place from May-June in 1940, reported The Independent.
The current mayor of Dunkirk, France says that filming of an American blockbuster would take place in June 2016 "by a world-famous director" and a regional daily newspaper from the north of France, says their sources are saying it is Nolan, who has been doing early location scouting with screenwriting partner and brother Jonathan.