• New Scripts & Styles component
• Support for the new is_customize_preview() conditional
• More robust handling of HTTP requests short-circuited with pre_http_request
• Introduce a query_monitor_silent_http_error_codes filter to allow certain WP_Error codes to be silenced in HTTP requests
• Split SQL queries on LEFT, OUTER, and RIGHT too
• Gracefully avoid fatal errors if a site is moved and the db.php symlink is no longer pointing to the correct location
• Pause Infinite Scroll when Query Monitor is viewed
• Support the new admin menu behaviour in WP 4.1
• Fix the positioning of output when using the Twenty Fifteen theme
• Switch to an AJAX call for setting and clearing QM's authentication cookie