Want to know technical information about Lync 2013 Preview?  Then these links are the place to go.  This is my list of goto people who are providing great information on Lync 2013.  There are plenty more articles and post being generated, be sure to follow the #lync hashtag on Twitter

http://blogs.technet.com/b/keithmayer/archive/2012/07/18/what-s-new-in-lync-server-2013-for-it-pros.aspx#.UAf5c5NwaUk 

http://technet.microsoft.com/en-us/library/jj204672(v=ocs.15)

http://www.shudnow.net/

http://imaucblog.com/archive/2012/07/16/introducing-lync-server-2013/

http://www.justin-morris.net/microsoft-lync-server-2013-preview-available-today-whats-new/