I'm now reading about the coupon redemption on a deals forum and well, it seems that a whole lot of people are abusing it. Like one who printed 50 coupons (well above the 4 limit). After church, brought his entire group with him to redeem free meals.
At least it says "while supplies last" and at "participating locations" so that might give KFC a chance to pull out before they really do lose tons of money.
There was one guy on there who stated clearly he's going to go in every day and redeem x amount until it's over.
Hope the abusers don't spoil it for the rest of you!