Allong with the release anouncement of the Lync Server 2013 Multitenant Hosting Pack, also known as Lync Hosting Pack v2 or LyncHPv2, Microsoft has published some interesting resources.
Quite a read with 91 pages, but very worthwhile, the Microsoft Lync Server 2013 Multitenant Hosting Pack Deployment Guide explains what Lync HPv2 is, including what is new, and how to deploy it http://www.microsoft.com/en-us/download/details.aspx?id=39101
For a quick comparison of the features of Lync On Premise, Lync HPv2 and Lync Online the Lync Features Comparison Chart, http://www.microsoft.com/en-us/download/details.aspx?id=38816
And providing insight in a real world deployment Microsoft Lync Server 2013 Multitenant Hosting Pack Customer Solution Case Study – ConnectSolutions NextUC, http://www.microsoft.com/en-us/download/details.aspx?id=39100