I think they cancelled my order without telling me...
I just checked my account activity on my credit card and $5 just got returned to it from a purchase I made at Best Buy on July 29th. The only thing I can think of is that it is my Limited Edition preorder.
I haven't been notified otherwise and no $50 card offered...
You preordered pretty late in the month so I'm not surprised your order got canceled.
My order for PS4 Ghost Edition was placed July 11th and was canceled on July 21st.
There shouldn't be a reason why you were canceled, since you preordered the day the GE went up. Did you use a credit card to preorder? I know BB puts a pending charge on the card every week or so, just to make sure it has funds, and if it doesn't then they cancel the preorder AFAIK.
Both of you should relay your concerns to the BB reps over at the BB unlocked forums. They've also helped people who had trouble claiming their $50 gift card compensation.