Exchange, Office and Lync development team has now reached what they think is a good and stable release to distribute it to customers, aka RTM. But hold your breath for a while since it will not be available for download today, but will be staged out to customers during the next few months.
The Exchange team announcement. http://blogs.technet.com/b/exchange/archive/2012/10/11/the-new-exchange-reaches-rtm.aspx
Lync team announcment http://blogs.technet.com/b/lync/archive/2012/10/11/lync-2013-is-finished.aspx
Office team announcment http://blogs.office.com/b/office-news/archive/2012/10/11/office-reaches-rtm.aspx