This is actually what I do for a living, so I can for once give some insight in to this.
The ad will be real, however it was most likely placed by an Apple affiliate. They write the copy, and set a bid price. An add such as this will almost certainly generate significant clicks - which in turn means lots of cookies on people's computers for the Apple store. Therefore, regardless of what gets announced tomorrow, it's a fair chance that a large number of people will order *something*. The affiliate receives a commission on all sales (within a 30 day period).
Basically it's just a clever way of placing Apple store cookies on your systems, and creaming a percentage off what everyone spends when the store is back online tomorrow.