I need to do some third party extension updates on most or all of the Joomla websites I look after.
I am wondering when the next Joomla updates (i.e. Joomla 2.5.21 and Joomla 3.3.1) are planned to be released as I could easily wait a few days, if a Joomla release is imminent, and do the Joomla updates at the same time.
Is there an official page or a forum or similar where I can find this out?
There is the official roadmap which is posted at http://developer.joomla.org/cms/roadmap.html. It gives you the broad picture at which month the minor releases are going to be released
As for patch releases, they are released "as needed". Best bet is to monitor the google groups like https://groups.google.com/forum/#!forum/joomla-dev-cms. Usually something is posted there when we're going to prepare a release. Like currently languages haven been freezed to prepare the release of 3.3.1 / 2.5.21. Other than that, there is not really an announcement for those patch releases.
Future updates of Joomla will be on these dates:
You can see dates and estimates of future updates of Joomla on these links: http://docs.joomla.org/Joomla!_CMS_versions http://en.wikipedia.org/wiki/Joomla#Version_history
