The new version of MediaWiki will be on test wikis and MediaWiki.org from 23 October. It will be on non-Wikipedia wikis and some Wikipedias from 24 October. It will be on all wikis from 25 October (calendar).
The Community Wishlist Survey begins on 29 October. The survey decides what the Community Tech team will work on. You can post proposals from 29 October to 11 November. You can vote on proposals from 16 November to 30 November.