Figured I would give my experience: I just bought Path of Fire standard edition through Gamestop.com and now under my account there it has listed it was prepurchased but won’t get the code until 5:00 AM on September 22. So maybe if I do get the code then and can enter it before ANet officially releases the expansion I’ll get the prepurchase rewards but otherwise it doesn’t look like it, especially since that may be when they plan to start the update.