It's March and seems to be the month when KFC does coupons. They did it last year too.
Here's a whole bunch for signing up.

http://www.kfc.com/coupons/ageverification.asp

Or if you want, you can go here and not register. Just change the last five digits of the URL to your zipcode.

http://kfccoupons.cre8hosting.com/index.php?option=com_kfc_coupons&zipcode=92129