I believe the date on the coupon is incorrect. According to DJI's website, you have until the 31st of this month (a week) to use the coupon. It is a coupon/rebate (depending on the dealer) on a phantom 2 or phantom vision.
I've been informed that UAVproducts.com is only accepting it on the vision or the 2 with gimbal package and they are sending it to you as a rebate. 1uas.com will send you a $150 coupon code for their website if you email them with your DJI rebate number. B&H will give you a quote for the phantom 2/vision with the discount off the top if you email them ahead of time. Those are really the top 3 companies I would buy from. If you have the money and don't mind a refund after the fact, UAVproducts has over night delivery at no extra charge. If you want the credit right off the bat, B&H will give it to you but requires some back and forth emailing. If you want the credit off the top and don't want to do a lot of emailing, 1uas.com is where to go.
Basically it is up to your dealer on if you get it as a rebate or a coupon.