The new Wave 2013 Platform (Exchange 2013, SharePoint 2013, and Lync 2013) use a new server called the Office Web Apps Server. This is important not to confuse this server with the Outlook Web Access or Outlook Web App server in Exchange. Both functions unfortunately use the same abbreviation OWA. So, you need to be careful as you read through the documentation to distinguish if the documentation is referring to an Office Web Apps server or Outlook Web App function. In this post, I created an Office Web Apps server and connect it to Lync 2013.
Office Web Apps Server as it appears in Lync 2013 Topology Builder
The step by step process that I used to create the Office Web Apps server is documented here: Building Office Web App Server and Integrating With Lync 2013