It's possible that certain distributors have gotten copies and others haven't. It's also possible that some broke street date, which happens.
The game hasn't broke street date from what I can tell, but it appears that the 26/09 release date Mayfair had on their site (before it mysteriously disappeared on that day...hmm) was only applicable to Germany. It's available at German websites (interestingly, in full English as well) such as Cosimshop.de
As for a wider release, my gut feeling is that we're in for a bit of a wait. According to my FLGS, Esdevium aren't even aware of the game's existance yet...which is not a good sign when suppliers generally know exactly what's coming a few weeks in advance. This is only for the UK though - the situation might be different in America.
I've personally gone ahead and placed an order at Cosimshop, as I can't wait for this game (and the shipping costs are, at least, a lot more reasonable than if I were ordeering from America to the UK).