This video was just issued from KFC. I guess when things seem too good to be true, they usually are. Here's what's on their website as well regarding this "raincheck":

We are so sorry, but due to the overwhelming demand for our FREE Kentucky Grilled Chicken™ meal, we’re unable to offer it in our restaurants today.

Please visit your local KFC to pick up a rain check form. Complete the form, attach your coupon and we’ll send you a coupon for your free meal at a later date, plus a free Pepsi with our compliments.

Your local restaurant manager will provide you with the form you need.

Thank you for your understanding,

Roger Eaton

KFC® President

If I'm reading this correctly, with these new circumstances, you have to head in to your local KFC, grab/ask for a form, and then wait to get a free coupon (in the mail?) at a later date? Sounds like a ton of work for a meal worth only a couple dollars to begin with.