In recent months, Microsoft announced that Skype would be replacing Lync as the collaboration product in Office. Branded as Skype for Business, it will soon be coming to a computer near you.
The Skype for Business update will only affect users currently running Lync 2013. If you are running Lync 2010, then nothing will happen. Lync 2010 users can still communicate with Skype for Business users.
Software-wise, most collaboration products function the same so the change should be fairly smooth. When your workstation is updated, you will see a new interface that's a combination of Lync and Skype. Users can still chat, share files, and communicate just like before with most of the improvements being behind the scenes.