I apologize for not having sent these emails in a while. I'll send catch-up ones for wmf15 through wmf18 later today. But first, today's branch: wmf19.

Over the next few days, wmf19 will be deployed to WMF wikis. The highlights of what's new in wmf19 are:

• You can now expand the single topic view to full width in Flow.
  
• In Flow, posting a new topic, posting a new reply and editing a board's description now use the new, rewritten editor system. This should only cause minor changes in appearance and behavior, but there may be bugs. Editing existing topics and replies, and editing summaries, still use the old editor system; they will be migrated to the new system later. Nice features of the new system include:
• When switching from wikitext to VisualEditor or vice versa, the editor no longer loses focus.
• You can cancel out of the editor by pressing Escape.
  
• If you click Cancel (or press Escape), then open the editor again, the text you wrote will still be there.
• We fixed a regression introduced in wmf14 that caused new Flow topics not to appear in the watchlist.
  
• Translations for the Topic namespace were added for Vietnamese (vi), Central Kurdish (ckb), Northern Luri (lrc), Mazandarani (mzn) and South Azerbaijani (azb), and the translation for Persian (fa) was corrected.

wmf19 is being rolled out according to the standard deployment schedule:

• Tuesday 11am-1pm PDT (6-8 hours ago): deployment to test wikis ("group 0"); for Flow, these are testwiki, test2wiki and mediawiki.org
  
• Wednesday 11am-1pm PDT (16-18 hours from now): deployment to non-Wikipedia wikis ("group 1"); for Flow, these are meta, officewiki and wikidata
  
• Thursday 11am-1pm PDT: deployment to Wikipedias ("group 2"); for Flow, these are the English, French, Hebrew, Portugese, Catalan, Telugu, Russian, Punjabi and Chinese Wikipedias