• Report @-suppressed PHP errors separately, and don't display a highlight colour in the admin toolbar.
• Introduce a collector for the template hierarchy (WordPress 4.7+).
• For consistency, switch to kB for the admin toolbar memory output.
• Lots of accessibility improvements for tables.
• Improve the layout of the HTTP and Transients panels when there's no data to show.
• Ignore the new WP_Hook class when generating back traces.
• Separate out the Scripts and Styles panels in the admin menu.
• Use semantic list items for lists of data that don't need to be in separate table rows or separated with line breaks.
• Improve a bunch of internationalisation.
• Collect the current logged in user data, and the currently switched user (from User Switching) if appropriate. Not exposed by default.
• Collect the request start time, and adjust the names of the properties used for the request time taken. Not exposed by default.
• Clean up the data that's collected by the admin component.
• Move a bunch of processing from the admin outputter to its collector.
• Remove transport information from the HTTP panel as it's useless since WordPress 4.6 and had questionable value prior to that.