This idea is based on another tool
You can see another display data using the first display quickly
This option allows you to view another display related data from the first and we can also see another level of detail.
There an idea that is embeber html in tooltip , this idea would be based into something resembling, of course, this functionatilty have to pass some parameters for connect first visualization with second visualization embebed in tooltip.
it´s true that you can to call other dashboard with link option, but you lost dashboard focus.
thanks for vote!
--> Community Manager update [Ciara Brennan]
Feature released in Tableau 10.5