Totara 2.4.15 is a "snapshot" release containing bug fixes and improvements.

Here's the changelog:

Release 2.4.15 (17th December 2013):
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Improvements:
    T-11669    Made the "Date Created" field editable for learning plans
    T-11566    Made 'My Reports' and 'My Bookings' pages editable so that blocks can be added
    T-11708    Added new optional column "preferred language" to reportbuilder user report source
    T-11708    Improved the display of language columns in the reportbuilder
    T-11449    Changed custom fields message when no file is selected
    T-11321    Session info is now included in notification emails when Face-to-face details are updated

Bug Fixes:
    T-11721    Fixed the missing string error 'course:viewsuspendedusers' while defining roles
    T-11710    Fixed the "CC managers" setting for facetoface notifications
    T-11629    Fixed programs sending duplicate enrolment messages when changing due date between set and relative
    T-11657    Fixed role name missing in security overview report
    T-11608    Fixed "Restrict initial display" option not being applied in embedded reports
    T-11705    Fixed potential call to nonexistant function while updating program assignments
    T-11650    Fixed access to facetoface approvals page with guest access enabled
    T-11569    Fixed the required course grade for languages using different characters for the decimal point
    T-11687    Fixed textarea and file custom course fields not displaying in report builder
    T-11673    Fixed access to reports when site roles have been renamed
    T-11552    Fixed icals not opening automatically in Outlook 2010
    T-11642    Fixed the positioning of the page footer while using the mymobiletotara theme
    T-11647    Removed confirmation message when signing up for Face-to-face session with 'No email' option

API Changes:
    T-11662    Added a database event to delete related position assignments when a user is deleted