What would BTS have to do with refurb availability?
They were probably thinking that people might return lightly used MBAs so that they could take advantage of the BTS offer.
So I was at the Apple Store today (in Fairview Mall, ON) and the asked the sales rep about the Back to School promo. He mentioned that they were told it would "start sometime at the end of June". Not sure how reliable this info is but just thought I'd share.
I really hope he actually did know and wasn't just pulling something out of thin air.