The problem is, the fix won't work without the firmware "AthrBT_0x11020100.dfu".
I just found a Windows version of the firmware 
(http://driveragent.com/c/archive/f2ea5a6c/Qualcomm-Atheros-Communications-Bluetooth-Controller-software-update-released-in-January--2014?PHPSESSID=09f4763lvg0gd1s9qc3ap62kn2)

I removed the "patch" from the original post, because it isn't really a patch.
Instead, here is a dkms package which adds the ID in btusb.c and ath3k.c
After applying the package and adding the (currently) missing firmware files 
"AthrBT_0x11020100.dfu" (and probably ""ramps_0x11020100_40.dfu") to 
"lib/firmware/ar3k/", Bluetooth should work.

** Attachment added: "ar9462-dkms_1.5.1_all.deb"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1394368/+attachment/4264502/+files/ar9462-dkms_1.5.1_all.deb

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https://bugs.launchpad.net/bugs/1394368

Title:
  Bluetooth with AR9462 doesn't work (New ID /Firmware)

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