Moodle 2.6, currently scheduled for a November/December release date has been released as a Beta to the community and is available from the download page at Moodle.org: http://download.moodle.org/. As a beta release this code does not have any stamp of approval for production and is being updated daily by the community. However if you’re interested in testing or testing your custom plugins in advance of a 2.6 stable release this is the code you’ll want to setup and start playing with.
Moodle 2.6 incorporates several usability fixes including: improved category interface, bulk course creation, roles import/export, collapsed TinyMCE editor, simplified password reset and much much more.
Check out the full release notes at: http://docs.moodle.org/dev/Moodle_2.6_release_notes