The new version of MediaWiki will be on test wikis and MediaWiki.org from August 4. It will be on non-Wikipedia wikis from August 5. It will be on all Wikipedias from August 6 (calendar).
You can join the next meeting with the VisualEditor team. During the meeting, you can tell developers which bugs are the most important. The meeting will be on August 4 at 19:00 (UTC). See how to join.