I worked at Tableau until very recently and I can't think of any way that the Salesforce acquisition has improved things yet (I do think it will eventually improve things). Did you hear about anything specific?
Now, these could all have very well been in development before the acquisition, but as a whole, the capabilities have grown tremendously since that time.
Also, it seems like the licensing options for smaller businesses has really been focused on since the acquisition. It's become much more affordable for a small business to get and use Tableau compared to 4-5 years ago.