http://www.techworld.com/security/news/index.cfm?RSS&NewsID=11665
"Following the lead of Microsoft and Oracle, Cisco Systems will start releasing security patches for some of its products on a schedule.
...
The first of these scheduled updates will occur on Wednesday, 26 March, and Cisco will continue to release patches on a twice-yearly schedule after that, Cisco said in a note posted Wednesday on its website. These firmware updates will ship on the fourth Wednesday of September and March each year."
-Hank