Apple’s recent announcement of a proper press reviewing system left quite a few of us scratching our heads about what actually happened and what these coupons can do – the information available was extremely vague.
So far the promo codes are valid in the US App Store only.
A coupon is issued per game, it is not limited to a device id.
One coupon is for one reviewer (US App Store account).
This IMHO answers most of the questions – if not, please leave a comment and I will see what we can do!