MediaWiki 1.21

This is the version of MediaWiki currently on Wikimedia Foundation websites.

The Wikimedia Foundation deploys MediaWiki to its projects almost directly from the master branch through incremental "wmf"-branches within the 1.21 release cycle. The 1.21.0 stable tarball is expected to come out in the spring of 2013 (but one can also stay current on the bleeding-edge through git master).

Wikimedia deployments
MediaWiki 1.21 will include all changes released in the smaller, bi-weekly "1.21wmfX" software deployments to Wikimedia sites.

What's new?
Internationalization:
 * ContentHandler

Extensions:
 * No new extensions bundles have been decided for now, but we'd like to consider some: see Suggestions for extensions to be integrated.