For those who haven't heard through Twitter or other channels, Lync 2013 is code-complete, with a general availability target of first quarter 2013 as part of the Office 2013 suite. It isn't clear from the announcement, but this is for the Lync 2013 CLIENT, not server. Since Exchange 2013 and Sharepoint 2013 have been announced, I'm sure we'll be hearing about Lync Server 2013 achieving the same milestone fairly soon.
UPDATE: Well, confusion reigned among some of the MVP mailing lists. While some were saying the Lync 2013 announcement was for the client, others were saying it was for the server. Seeing how all the other servers in the "suite" have been announced, I think its safe to say that Lync Server 2013 is part of it.