Chris Webb takes a look at SQL Server 2016, specifically around Multidimensional Analysis Services:
In fact the drillthrough/multi-select improvements (which I blogged about here) already shipped as part of SSAS 2014 and are reliant on improvements in Excel 2016 as much as in SSAS; similarly the Excel 2016 query optimisations are not reliant on any changes in SSAS 2016 and will benefit users of all versions of SSAS.
So what has actually changed with SSAS 2016 Multidimensional? I don’t know all the details on every change, but here’s what I know right now:
It sounds like the answer is “not much.” Tabular has been getting more love in Analysis Services.