Public support for Windows Server 2012 R2 Web Application Proxy as a reverse proxy for Lync Server 2013 is now available on Microsoft Unified Communications Open Interoperability Program (UCOIP) Infrastructure Qualified for Lync site.
Read more at source: http://blogs.technet.com/b/rischwen/archive/2014/11/21/support-for-windows-2012-r2-web-application-proxy-as-reverse-proxy-for-lync-server-2013.aspx