The preview of CTP 1.1 of SQL Server vNext, the latest version of SQLServer, contains important new features and enhancements for Analysis Services Tabular:

Connecting to new data sources as currently offered by Power BI: multiple file types, databases, Azure sources and other online services, Big Data systems, Facebook, etc.

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Possibility of transforming data directly into the tabular model: dividing columns, hiding columns, changing data types, etc. using a query editor in the style of Power Query and PowerBI.

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Custom drill down in Microsoft Excel: allows you to customize the detail of a measure’s data in an aggregate report. For instance, when end users see the total sales per region and per month, they can see the detail of the associated order.

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These enhancements, along with DAX’s improvements and security enhancements, will make tabular models the most recommended in most scenarios. You can see further details in this Microsoft blog entry.