A new development release of xrandr has been announced this morning with bug-fixes an updated manual, and support for new RandR 1.3 properties. New xrandr options have been added for --current, --nograb, --primary, and --noprimary. The --current option will return the current state of screen configurations, --primary will set an RandR output to be the primary output, and --noprimary will not define a primary output. With the existing RandR 1.2 drivers, there is now also support for adjusting the gamma through the --gamma argument and then specifying the RGB values. Lastly, the --transform and --scale options are now documented within the man page.
The release announcement for this new test release of xrandr can be found on the X.Org mailing list. Around the time of releasing X Server 1.6, we should see the final release of xrandr 1.3.0. For those interested in controlling their RandR outputs through an RandR GUI may need to wait longer for the support of version 1.3 features.