The AHA Guidelines for 2015 include some important changes involving activation of EMS from mobile phones and timely use of an AED. The AES CPR Methods module and the Shock and Resuscitation module were updated to incorporate these changes, as well as other updates and corrections.
These updates were automatically incorporated into the existing module. There is no action you need to take.
For a short overview of the AHA changes that can impact your CPR lesson plans, read this post: Quick Guide to 2015 AHA Updates for CPR Lesson Plans