Just to let you all know, the 2.3 Moodle Docs wikis in English and in German have recently been copied in order to create the wikis for 2.4: docs.moodle.org/24/en and docs.moodle.org/24/de.
In the next few weeks we'll be documentating all the new features and improvements in Moodle 2.4 ready for the release in December.
As always, help with the documentation is much appreciated. If you'd like to help, you can log in to the wiki using your moodle.org username and password and then edit pages. Please see the list of tracker issues labeled 'docs_required' for new features and improvements awaiting documentation.