Just got off the phone with a very pleasant rep discussing my existing order.
Ordered on 3:10AM EST:
128 GB Black 7+
128 GB Silver 7+
Expected delivery date of 9/28
She didn't see any change or different dates in my order, but she had "general" dates in October for those 2 models. She said to go by the date in your confirmation email.
She also put a note in my account to refund the 2 $20 upgrade fees after they get charged in my credit card. She said you shouldn't pay those if you upgraded online.
Asked her about buying in store on Friday if they just happen to have the 2 models I want. She said the store should be able to cancel the preorder and sell you the ones in store. Not holding my breath on any Pluses being in stock on Friday, though.