This post is now ready for publication in WordPress. If you have last-minute edits to make, please ask Fabrice and he'll be able to implement them.
We are now targeting a Nov. 7 publication of this blog post, to coincide with the worldwide release on all wikis.
In the meantime, we will use mailing list announcements to invite community members to test this product on MediaWiki.org, starting on Oct. 31.
To learn more about Beta Features, check out this project overview, which we will link to in all announcements up to Nov. 7.