The scheduler now supports the "first-index" operation attribute for the Get-Jobs operation (STR #2913)
Changed the default AccessLogLevel and PageLogFormat to disable the access_log and page_log files by default (<rdar://problem/16495000>)
cupsRasterInterpretPPD now supports the Orientation header in order to support long-edge feed raster printers (<rdar://problem/15837926>)
The scheduler now allows run-as-root backends to have group read and execute permissions (STR #2935)
The ippFindAttribute and ippFindNextAttribute functions now support hierarchical searches (STR #4395)
Dropped OpenSSL support in favor of GNU TLS.
Dropped "dark wake" support on OS X, which was preventing portables from going to sleep when there was a stuck job. We now use a variation of the CUPS 1.4 sleep support to do a cleaner sleep (<rdar://problem/14323704>)
Dropped support for AIX, HP-UX, and OSF/1 (aka Digital UNIX)
Dropped lppasswd and support for Digest authentication in in the scheduler (STR #4321)
The cupsGetClasses, cupsGetPrinters, and cupsTempFile functions are no longer supported.
The scheduler now caches more job history data and limits the number of completed jobs returned by Get-Jobs as needed in order to prevent a denial-of-service on busy servers (STR #2913)
The filter/backend sandbox on OS X now defaults to a more strict whitelist (<rdar://problem/15939788>)
Increased the default idle exit timeout to 60 seconds on OS X (<rdar://problem/16041820>)
Printer classes were not accessible on OS X (<rdar://problem/16385643>)
The scheduler now uses </DefaultPrinter> to close the default printer definition in printers.conf (STR #4153)
Canceling all jobs in the web interface now just cancels the jobs (STR #1914)