The latest kernel doesn't seem to have made a difference:
[    53.415] (II) config/udev: Adding input device PS/2 Synaptics TouchPad 
(/dev/input/event4)
[    53.415] (**) PS/2 Synaptics TouchPad: Applying InputClass "evdev pointer 
catchall"
[    53.415] (II) Using input driver 'evdev' for 'PS/2 Synaptics TouchPad'
[    53.415] (**) PS/2 Synaptics TouchPad: always reports core events
[    53.415] (**) evdev: PS/2 Synaptics TouchPad: Device: "/dev/input/event4"

Linux localhost 3.17.0-031700rc6-generic #201409211935 SMP Sun Sep 21
23:37:11 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


But I also tested using the Ubuntu 14.10 beta Live USB image and the problem is 
fixed in the 14.10 beta. I'm not sure how Xorg, udev and the kernel interfact 
when deciding whether a device is a 'touchpad' or just a 'pointer' but there 
must've been some change in Xorg or Udev that gets it working in 14.10 beta.


** Attachment added: "Xorg.0.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1372520/+attachment/4213523/+files/Xorg.0.log

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https://bugs.launchpad.net/bugs/1372520

Title:
  On Lenovo Yoga 2 Pro laptop PS/2 Synaptics TouchPad detected as
  pointer device by Xorg

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