They did something like that for the S3 (you could choose a refund or a coupon) but I don't recall if it was for any purchase or if it had an expiration date.
If this is true, it sounds like they are trying to do this at their own terms at the moment without mention of what the difference would be. I'm the type who negotiates... A 10% coupon is a win/win. They get more business and I get more affordable rig next purchase. Also, I could always sell the coupon for half price (5% discount) if I decided not to buy 14 more S7's in December [For whatever reason] like I plan to do.