I forgot to put "Unconfirmed" in the thread title, but it has more to do with the fact that I don't know if it'll be a SteelBook or a simple MetalPak.
Found this info:
The Dark Knight - Boîtier Métal - Edition spéciale Fnac - Blu-Ray
Out on February 13th for 30€.
UPDATE WITH PICTURES:
Still sealed
Front cover of SteelBook and small folder
Back cover of both the SteelBook and the folder
Interior of SteelBook plus the comic book and the two photos
Comic book