The new version of MediaWiki will be on test wikis and MediaWiki.org from 5 December. It will be on non-Wikipedia wikis and some Wikipedias from 6 December. It will be on all wikis from 7 December (calendar).
Very old versions of the Opera Web browser are no longer supported. This means that technical development will not be tested to make sure it works with those Opera versions. Use Opera 15 or above or another browser if you have problems. 
Almost 170 wikis with no high-priority errors in Linter categories will switch to use the Remex parsing library. This is to replace Tidy. A few larger wikis such as German and Italian Wikipedia will also make this switch. It will happen on 5 December. Other wikis will be recommended to switch soon when they have fixed the errors that must be fixed. Tidy will be removed in the middle of 2018. 
You can join the next meeting with the Editing team. During the meeting, you can tell developers which bugs you think are the most important. The meeting will be on 5 December at 19:30 (UTC). See how to join.
The Community Liaisons team at the Wikimedia Foundation is looking for active tech ambassadors. This is to make sure the Wikimedia communities get all the information they need about new features and can be involved in the technical development. 
A new tag marks edits where a redirect was created or removed. This still works when the editor writes something else in the edit summary. You can see the tags for example in the recent changes feed, article history, user contributions or on your watchlist. 
If you use Chrome on Android, you can now use the print to PDF button to create a PDF of an article. 
Filter by number of edits or filter by time range have been grouped on a same menu on the recent changes page if you use the new filters. The "Kitaen dagiti kabaruan a binaliwan" link is now more prominent. 
Some of the web fonts that were provided by the Universal Language Selector extension are being removed. This is to reduce the load time on pages. The web fonts were added many years ago to help users read text in scripts which did not have fonts or had broken fonts. This is not the case any more. You can check the status page for a list of all web fonts and whether they are currently being used and especially for special requirements. 
Changes later this week
The new version of MediaWiki will be on test wikis and MediaWiki.org from 12 December. It will be on non-Wikipedia wikis and some Wikipedias from 13 December. It will be on all wikis from 14 December (calendar).
You can join the next meeting with the Editing team. During the meeting, you can tell developers which bugs you think are the most important. The meeting will be on 12 December at 19:30 (UTC). See how to join.
Latest tech news from the Wikimedia technical community. Please tell other users about these changes. Not all changes will affect you. Translations are available.
Because of the holidays the next issue of Tech News will be sent out on 8 January 2018.
When you import a page from another wiki the usernames of the users who edited the article on the wiki you imported it from are shown in the article history. This should link to the users on the original wiki. A script to fix this caused problems for Wikidata and German Wikipedia. It also created a large number of SUL accounts on wikis where editors had never edited. 
Some bot owners got email about their bots logging in from a new computer. If this is from one or a couple of wikis, you can turn these messages off in your preferences on those wikis until the problem has been solved. If not, you can report more about the problem in Phabricator.
Changes later this week
There is no new MediaWiki version this week. There will be no new MediaWiki version next week either.
You can join the next meeting with the Editing team. During the meeting, you can tell developers which bugs you think are the most important. The meeting will be on 19 Disiembre at 19:30 (UTC). See how to join.
Files on Commons will have structured metadata in the future. The developers are now looking for examples of different kinds of metadata to make sure they are aware of them when they build prototypes for structured data on Commons. You can read more and help by giving examples of interesting media files.
The Structured Commons team are making sure Commons work with structured data. If you regularly contribute to Commons and Wikidata you can answer a survey that helps the team prioritise the tools that are important for the Commons and Wikidata communities. The survey ends on 22 December. You can read more on Commons. You can also help the team decide on better names for "captions" and "descriptions". This ends on 3 January 2018.