This has been proven to somewhat incorrect. Here is the link
via Novasry at 40K Forums
Just got sent this by the manager of one of the local LGS's
From August 17th, Games Workshop are changing their trade terms. This will effect the way that New Release information will be handled.
After August 17th, any shop selling White Dwarf or any New release item before the release date, discussing New Release information or posting images on Facebook, forums etc before release date will be punished by not being allowed to stock New Releases for 6 months !