I have installed the latest release of the TDM beta. The content SQL Preview tab cannot be refresh to the selected entities SQL script. After you click on the SQL Preview tab on the current entity, it will display the SQL script of the current entity, once you have use the drop down list to select different entity, the script is not updated to the relative one.
The SQL Script can only be refresh after you click on the other tab and click it back.
Please let me know if you want me to explain more