Tabular is just like SSAS Multidimensional: it provides an analytic abstraction layerto end users to allow easier analytic reporting and analysis.
The difference is that Tabular compresses data using column store and that it loads all data into memory.
You can build reports with SSRS on top of Tabular, or you could use Excel/PerformancePoint/Power View to create dashboards and reports on top of Tabular.