Totara 2.2.15 is a "snapshot" release containing bug fixes and minor improvements.

Here's the 2.2.15 changelog:

Release 2.2.15 (21st February 2013):
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Database upgrades:
    T-10069     Update certificate module to latest version
    T-8078      Fix Facetoface session timezones

Improvements:
    T-9898      Make my home/learning consistent
    T-10297     Add position start and end dates to totara_sync
    T-10266     Remove minimum time required in Programs

Bug fixes:
    T-5879      Fix references to moodle in auth.php
    T-5879      Fix the fileupload text descriptions in kiwifruit theme
    T-10288     Fix for front page favicon in kiwifruit theme
    T-10254     Fix Filepicker to stop deletion of draft files
    T-10030     Fix for dialog issues when closing and reopening them
    T-10291     Fix for issue with "menu of choices" user custom profile fields
    T-10148     Fix recurring courses to stop transfering course completion items
    T-10296     Fix progress bar when course completed via rpl
    T-10302     Fix course tooltip when using enrolment key on course with Self Enrolment enabled
    T-10233     Fix extra div in course (Topics format) markup when summary is empty
    T-10289     Fix MSSQL error for date custom field rules in Audiences
    T-10304     Fix dates in Excel download for non-English languages
    T-10294     Fix duplicate content being suppressed in mod/scorm/report
    T-10122     Fix datepicker error when creating new Learning Plan
    T-10251     Fix ability to remove mandatory courses from competencies in Learning Plans
    T-10311     Fix ability to submit dialogs without selected values in Programs
    T-10257     Fix sending of tasks/alerts on Facetoface signup when email to user fails
    T-10133     Fix display of OS-specific file path in totara_sync
    T-10229     Fix overwriting of required fields with empty values in totara_sync