Sometimes, it is hard to see important changes in a wikitext diff. This screenshot of a wikitext diff (click to enlarge) shows that the paragraphs have been rearranged, but it does not highlight the removal of a word or the addition of a new sentence.
If you enable the Beta Feature for "Visual differences", you will have a new option. It will give you a new box at the top of every diff page. This box will let you choose either diff system on any edit.
Click the toggle button to switch between visual and wikitext diffs.
In the visual diff, additions, removals, new links, and formatting changes will be highlighted. Other changes, such as changing the size of an image, are described in notes on the side.
This screenshot shows the same edit as the wikitext diff. The visual diff highlights the removal of one word and the addition of a new sentence.
You can read and help translate the user guide, which has more information about how to use the visual editor.
The 2017 wikitext editor is available as a Beta Feature on desktop devices. It has the same toolbar as the visual editor and can use the citoid service and other modern tools. The team have been comparing the performance of different editing environments. They have studied how long it takes to open the page and start typing. The study uses data for more than one million edits during December and January. Some changes have been made to improve the speed of the 2017 wikitext editor and the visual editor. Recently, the 2017 wikitext editor opened fastest for most edits, and the 2010 WikiEditor was fastest for some edits. More information will be posted at mw:Contributors/Projects/Editing performance.
The visual diff tool was developed for the visual editor. It is now available to all users of the visual editor and the 2017 wikitext editor. When you review your changes, you can toggle between wikitext and visual diffs. You can also enable the new Beta Feature for "Visual diffs". The Beta Feature lets you use the visual diff tool to view other people's edits on page histories and Special:RecentChanges. 
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Consultation on the creation of a separate user group for editing sitewide CSS/JS[edit source]
(Please help translate to your language)
I'm preparing a change in who can edit sitewide CSS/JS pages. (These are pages like MediaWiki:Common.css and MediaWiki:Vector.js which are executed in the browser of all readers and editors.) Currently all administrators are able to edit these pages, which poses a serious and unnecessary security risk. Soon, a dedicated, smaller user group will take over this task. Your community will be able to decide who belongs in this group, so this should mean very little change for you. You can find out more and provide feedback at the consultation page on Meta. If you are involved in maintaining CSS/JS code, or policymaking around adminship requests, please give it a look!