A change to the <charinsert> feature could break some user scripts. Contact Bawolff if the "click to insert special characters" links in the edit window break on your wiki. 
Elasticsearch will be upgraded on Wikimedia wikis this week. This should not affect you, but if you have problems with the search function this is probably the reason. 
The new version of MediaWiki will be on test wikis and MediaWiki.org from 31 May. It will be on non-Wikipedia wikis and some Wikipedias from 1 June. It will be on all wikis from 2 June (calendar).
You can join the next meeting with the VisualEditor team. During the meeting, you can tell developers which bugs you think are the most important. The meeting will be on 31 May at 19:00 (UTC). See how to join.