Hi @wkuntz,
Thanks for your question! This refers to the fact that the configured list of tables you see when you go to enter new records or build a query now come from the list configured exclusively in Specify 7 rather than using the XML-defined list created by Specify 6.
So when you click on 
Queries in the navigation menu and then click New, the list of tables you can choose from is now defined solely from the list you modify in 7.
The same is true for the 
Data Entry menu! The tables list defined in 6 will no longer be used.
This is stored in your UserPreferences app resource rather than in an XML file, and defaults can be set for all users at any level using the Default User Preferences system.