SP2013 Key changes to SharePoint Usage and Health Service App

For SharePoint Usage and Health Service App in particular.... what are the changes/enhancements in sp2013

Found this article here... but want to know how much of it is still valid

http://todd-carter.com/post/2011/04/26/extending-the-sharepoint-2010-health-usage-part-1-feature-and-capability-overview/

val it: unit=()