Microsoft demonstrated PowerView on top of the Multidimensional model in Analysis Services several weeks ago at SQL PASS and now the CTP version of the product is available here.
There are two pieces of new functionality delivered with this CTP:
- Update for Analysis Services engine to allow DAX support for Multidimensional models
- Update for the Reporting Services Integrated mode for PowerView. One new feature is ability to create Global Filters that span multiple PowerView Tabs