We will be migrating all users to Lync 2013 on Thursday morning. There should be no noticeable impact on users. If they are connected to Lync during the time of the migration, Lync will log them out and log them right back in. It happens in seconds, so we are not anticipating anyone even noticing.
Once everyone is migrated successfully, we will send out an announcement to the campus letting them know about the new features and directing them to the Lync webpage for more information, which has been updated to reflect the changes in Lync 2013, and encouraging them to attend a workshop.
We will also encourage users to install Lync 2013 (which they can get from the WebStore for free) so that they can take advantage of the new features.