Finally Microsoft announced, the next version of Lync will became Skype for business.
In first half of 2015, Lync Server (on-premises) is getting the name change to Skype for business as well as Office 365 version.
According to Gurdeep Sing Pall on blogs.skype.com, Lync will get a new name in the first half of 2015
“In the first half of 2015, the next version of Lync will become Skype for Business with a new client experience, new server release, and updates to the service in Office 365. We believe that Skype for Business will again transform the way people communicate by giving organizations reach to hundreds of millions of Skype users outside the walls of their business.”