Xorg 1.18.0 is entering [testing] with the following changes:

* You can now choose between `xf86-input-evdev` and `xf86-input-libinput`.

* `xf86-input-aiptek` will not be updated and will be removed when xorg-1.18.0 is moved to [extra]

Caveat:

NVIDIA drivers are not yet compatible with 1.18.0. You can block the upgrade by appending --ignoregroup=xorg to the pacman command or adding 'xorg' to IgnoreGroup in pacman.conf

URL: https://www.archlinux.org/news/xorg-1180-enters-testing/