The most recent development in this process to get the X Server no longer using HAL for input hot-plugging and device handling is the pull request submitted this week for the udev input-hotplug branch. This work now uses libudev on Linux for handling input device hot-plugging. Julien Cristau, the developer behind this udev input-hotplug branch, has said "I think this is now ready for prime time." However, when building the X.Org Server with this newest code it still is defaulting to off.
Here is the pull request for this work that should land in X Server 1.8, which is scheduled to be released in March.