Well, there already have been, at least at Best Buy. Those might have been just something BB did on their own, but I'd bet Apple has something in their sales contracts that says they own the pricing for their products, not the stores that sell them, so maybe that was done with Apple's blessing. I see that the wait times for these systems is "in stock" now, so maybe they've caught up with initial demand and want to do a promo to stimulate demand again, yadda yadda.
Anyway, I figured that if they were going to do something like offer a price break, 9/12 is a good time for that given the other announcements. Hope springs eternal, and all that.