As a followup to my blog Power View for Multidimensional Models – Preview Available, the final version is now available via SQL Server 2012 Service Pack 1 Cumulative Update 4.
So you can now create Power View reports against multidimensional models (the initial release only worked against tabular models). This is achieved through native support for Data Analysis Expressions (DAX) in Analysis Services multidimensional models. Note that you will need to upgrade your Analysis Services instance and the Reporting Services add-in for Microsoft SharePoint Server (2010 or 2013) with this Cumulative Update to create Power View reports against your existing multidimensional cubes.
Also note that Power View in Excel (on-premise or in the cloud) is not able to connect to multidimensional models, but that ability is high on Microsoft’s priority list.