To support the new authentication mode 'cookie', there is now a new configuration variable 'auth_type', and 'adv_auth' no longer exists. You can still use http basic authentication. As usual, start from the new config.inc.* file and read the documentation
bug with text and time type fields with the "query by example" feature;
bug with the database creation form that may be displayed when it shouldn't or may be missing when it should be displayed.
multiple tables printable view;
checkboxes for null values;
support for OS/2 browsers;
links to short page of MySQL documentation;
vertical display mode;
cookie authentication mode;
improved dump feature in order to limit timeout or memory out effects;
some languages were updated.