Games Day UK is effecting the release times of the White Dwarf according to this latest rumor, as well as releases.
Please remember that these are rumors.
via Faeit 212 (Anonymous Source)
Octobers White Dwarf will be released on 22nd of September.
all store managers got an email today that its release day was relocated to 22nd sept. due to the games day UK.
if the white dwarf announces something, it should be pre-orderable .
this heavily goes against the rumor you got, but usually you can preorder the major announcement that is in the WD on its release.
9th and 10th sept. there is a retail meeting taking place where all the store managers, might be a wrap up of the dark vengeance release