What is it?
We want to change links like https://ru.wikipedia.org/wiki/Википедия#.D0.98.D1.81.D1.82.D0.BE.D1.80.D0.B8.D1.8F to look like https://ru.wikipedia.org/wiki/Википедия#История
We're currently populating parser cache on all wikis with headings that contain both old and new IDs. After this ends on October 19, we will be able to switch link generation to new style. Particular schedule for the next step is up to discussion. Maybe, community liaisons can help us with figuring that out? We might want to start with one non-Latin wiki.
What about the old links?
Old links from third-party sites will continue to work.