2012 saw two major WordPress releases, addressing primarily theme customization and media management. There were also five security releases, a new default theme, and a record number of code contributions in the 3.5 release.
The site itself also saw some improvements, including a new plugin page design with plugin and theme reviews, and Make.WordPress.org, a network of sites where teams and contributors can easily communicate with each other.
Speaking of teams and contributors, 2012 also saw the very first WordPress Community Summit, a 2-day event attended by 108 of the top WordPress development, support, and overall community volunteers.
2012 was certainly a big year for WordPress, and with planning for WordPress 3.6 already underway, it looks like they’re going to hit the ground running in 2013.