The visual editor and the 2017 wikitext ask you to write an edit summary after you press Publish. This button now also shows an ellipsis. This is to show that pressing Publish is not the last step. 
Changes later this week
The new version of MediaWiki will be on test wikis and MediaWiki.org from 24 April. It will be on non-Wikipedia wikis and some Wikipedias from 25 April. It will be on all wikis from 26 April (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 24 April at 18:30 (UTC). See how to join.
You can join the technical advice meeting on IRC. During the meeting, volunteer developers can ask for advice. The meeting will be on 25 April at 15:00 (UTC). See how to join.
<mapframe> will come to most Wikipedias in May. This means that you can put interactive maps in the articles. Nine Wikipedias that use a strict version of flagged revisions will not get this feature in May. 
The rollback function could change. This was a German community request. All editors with rollback rights can leave feedback on the proposed solution. The last day to leave feedback is 4 May (UTC).