A new user group on Commons will be able to upload MP3 files. The plan is to have this user group from 17 November. 
Wikis using Flagged Revisions will get the New filters for Edit Review by default on the recent changes pages. It will be possible to opt-out in user preferences. 
The new version of MediaWiki will be on test wikis and MediaWiki.org from 14 november. It will be on non-Wikipedia wikis and some Wikipedias from 15 november. It will be on all wikis from 16 november (calendar).