The problem with this sort of thing is a PC version hasnt actually been annouced as such, and certainly never a release date, so these stores never had a game to take pre orders on and certainly couldnt say it had been cancelled, you cannot cancel something which technically was never announced
I know that doesnt help you guys in trying to work out whats going on, I guess my point as its always been with this and similar issues is that information from online stores is not reflective of facts. Ultimately they want pre orders, the system needs a release date to take them so they'll pick what they consider their best educated guess. I suspect whats happened in this instance is they have done just that, then after a long period of still no date and no doubt many customers requesting more information, decided its best to remove the game from its listing which would on their system at least show as a cancellation even though its not whats happened.