Description:
Dependences are wrong.
"core/udev 182-4" do not working with "core/mkinitcpio 0.8.8-1"
The function "add_runscript" is not present yet in the "/usr/lib/initcpio/functions"
Upgrade was without any problems (24.05.2012).
Looks like too early added package with wrong dependences.

Additional info:
$ pacman -Qs udev; pacman -Qs mkinitcpio
local/udev 182-4 (base)
The userspace dev tools (udev)
local/hwdetect 2012.04-2
Hardware detection script with loading modules and mkinitcpio.conf / rc.conf support
local/mkinitcpio 0.8.8-1
Modular initramfs image creation utility
local/mkinitcpio-busybox 1.19.4-2
base initramfs tools

$ grep -R add_runscript /usr/lib/initcpio/
/usr/lib/initcpio/install/udev: add_runscript

Steps to reproduce:
sudo mkinitcpio -p linux
==> Building image from preset: 'default'
-> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux.img
==> Starting build: 3.3.7-1-ARCH
-> Parsing hook: [base]
-> Parsing hook: [udev]
/usr/lib/initcpio/install/udev: line 15: add_runscript: command not found
-> Parsing hook: [autodetect]
-> Parsing hook: [scsi]
-> Parsing hook: [filesystems]
-> Parsing hook: [fsck]
-> Parsing hook: [shutdown]
==> Generating module dependencies
==> Creating gzip initcpio image: /boot/initramfs-linux.img
==> Image generation successful
==> Building image from preset: 'fallback'
-> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux-fallback.img -S autodetect
==> Starting build: 3.3.7-1-ARCH
-> Parsing hook: [base]
-> Parsing hook: [udev]
/usr/lib/initcpio/install/udev: line 15: add_runscript: command not found
-> Parsing hook: [scsi]
-> Parsing hook: [filesystems]
-> Parsing hook: [fsck]
-> Parsing hook: [shutdown]
==> Generating module dependencies
==> Creating gzip initcpio image: /boot/initramfs-linux-fallback.img
==> Image generation successful