D'après "The Lync Team Blog" de Microsoft, le client Lync 2013 est finalisé en terme de développement.
Il devrait être disponible quelque part dans le 1ier trimestre 2013
We wanted to let all of our blog readers know that the engineering team has signed off on the Release to Manufacturing (RTM) build of Lync 2013, as-of today, October 11th, 2012! General availability is planned for the first quarter of 2013. Starting October 19, any customer purchasing Office 2010 in retail will receive the new Office for free upon availability. Customers will see a preview version of the new Office on Windows RT devices, beginning with the Windows 8 launch on October 26.