WorldCat Discovery is the latest catalog/discovery service from OCLC. It is officially replacing OCLC FirstSearch December 31, 2015. It will eventually replace WorldCat Local, our current catalog.
Libraries with access to WorldCat Discovery initialized (which we are) can make the switch to Discovery at any time. All you need to do is simply start using the above URL. In other words, replace links and edit search boxes to the new address. OCLC suggests that libraries offer WorldCat Discovery as an additional link (Try the new catalog! New search beta!) at first so users get used to it, etc.