Tableau 9.0 is now available to everyone with current maintenance. You can download it from the Customer Account Center.
The theme of Tableau 9 is "Smart Meets Fast," so in Tableau 9 we’ve added a number of features that make the product smarter about what you’re doing: from automatic data prep to help you get data into your analysis, to more analytics features, to smart maps with geographic search. And across that entire analytic flow, we’ve invested heavily in performance. And finally, we’ve rewritten Tableau Server and Tableau Online to help you share your findings and collaborate with data.