(sorry for cross posting)
on July 21 23:00-00:00 (UTC) RevisionSlider got deployed as a beta feature
on German Wikipedia, Arabic Wikipedia and Hebrew Wikipedia.
The RevisionSlider extension adds a slider interface to the diff view, so
that you can easily move between revisions. It helps users to view edit
summaries and other meta data of all revisions while hovering over the
slider interface. At the current state, the last 500 revisions can be
The RevisionSlider extension was developed by Wikimedia Deutschland's TCB
team and fulfills a wish from the German-speaking community's Technical
Wishlist.  It is based on a rough prototype by the Community Tech Team
who we love collaborating with. 
The feature already was presented at WMF's last metrics meeting, so if you
are interested to hear more about it, you can also have a look into the
video record. 
Why German, Arabic and Hebrew Wikipedia in the first round?
As a first step, we want to see if RevisionSlider works well on both, LTR
and RTL Wikipedias. The decision for German Wikipedia is probably obvious,
as the RevisionSlider addresses a wish from the German-speaking community.
But the team spent also some work in optimizing the feature for RTL
languages, and we were talking to people from Arabic and Hebrew Wikipedia
at Wikimania. Both communities created a site request ticket to deploy
RevisionSlider as a Beta feature on their projects.  
So far everything went well and we also got our first really nicely written
bug report from Hebrew Wikipedia - https://phabricator.wikimedia.org/T141071
We are really happy about the constructive and appreciative collaboration
style around RevisionSlider, it's so much fun working like this! Thanks a
lot to everyone who was/is involved in the work around the feature! This
includes people from German, Arabic and Hebrew Wikipedia and people from
the WMF, who did the security review and helped with other important stuff.
A special thanks goes to Moriel Schottlaender, who gave us valuable advice
on how to RTLize the feature and who even contributed code!
Next steps: We want to see how RevisionSlider works on dewiki, hewiki and
arwiki and then we can think about providing the feature also for other
It would be great if you find time to test the feature and give us
feedback! If you're usually not a user of German, Arabic or Hebrew
Wikipedia, you can also go to Beta Labs and try RevisionSlider with an
English-speaking article set. 
Community Communications Manager
Software Development and Engineering
Wikimedia Deutschland e.V. | Tempelhofer Ufer 23-24 | 10963 Berlin
Tel. (030) 219 158 26-0
Stellen Sie sich eine Welt vor, in der jeder Mensch an der Menge allen
Wissens frei teilhaben kann. Helfen Sie uns dabei!
Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e.V.
Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg unter
der Nummer 23855 B. Als gemeinnützig anerkannt durch das Finanzamt für
Körperschaften I Berlin, Steuernummer 27/681/51985.