The classifications, suggestions, rules and taxonomy pages now all appear under the new Classify menu.
The Settings page is now accessed from the icons on the right hand side of the menu.
The API page is now accessed from the Settings page.
Shift-click for column sampling query has been changed to ctrl-click.
On the Classification page, ctrl-clicking on a column will now copy a SQL statement to your clipboard. You can then paste that SQL into Microsoft SSMS (SQL Server Management Studio) to inspect the top 100 values of that column.