These things would be nice to have:
  o log the relationship of the kernel name and the persistent disk name
    to syslog, so any error logged from the kernel can be associated with
    any of the links at that time

These things will change in future udev versions:
  o remove /sys prefix from symlinks in /dev/.udev/{queue,failed}
    (broken tools search /dev for files and get lost following to /sys
     and stat() sysfs files million times)

  o make DRIVER== to match only the event device
    (DRIVERS must be used, we currently translate it to DRIVERS and print
     an error if DRIVER is used)

  o switch to fnmatch() instead of our own implementation

  o warn if PHYSDEV* keys are used in ENV keys
    (they are deprecated and will be removed from a future kernel)

  o warn if "/device/" is used in a ATTR, ATTRS, $sysfs key
    (the device link must not be used in rules or tools, udev resolves
     the link and makes the devices available as parents, which can
     be matched with the normal keys)

  o warn if BUS, ID, SYSFS are used as keys
    (they are SUBSYSTEMS, KERNELS, ATTRS now)

These things are deprecated and scheduled for removal in a future
udev version:
  o remove old udevdb dump 'udevinfo -d'
    (-e exports everything)

  o remove udevstart
    (we rely on the kernel "uevent" triggers of kernel 2.6.15 and no longer
     want to guess event properties from sysfs like udevstart is doing it)

  o remove extra for /etc/dev.d/ /etc/hotplug.d/
    (that inefficient stuff should finally go away)