only the ones with the "pick up today" button will take the coupon. i tested it myself this morning... ordered silver 64bg... register said there are no items in the order the coupon could apply to. so i went back and placed another order for 64gb gold... coupon sailed right thru.
the ones that will take the coupon are wifi only:
16gb - grey, gold, silver
64gb - grey, gold
64gb silver, ipads with cellular, or 128gb will NOT work.
Hope this helps, coupon definitely worked this morning.