Microsoft is updating the Core Client Access License Suite (Core CAL Suite) to include Lync Server 2010 and Forefront Endpoint Protection.
Current Core CAL customers with Software Assurance (SA) as of August 1st can choose to sign an “Early Use Rights Amendment” that will allow them to utilize the new features today at no additional cost. Contact your Microsoft licensing vendor for more details.
SoftChoice, a Microsoft Gold Licensing partner, put together a great document and FAQ about the new changes. You can download it here.