The answer appears to be yes if this [0] is to be believed:
> UPDATED April 06 2015, to include the latest underlying libraries - libplist, usbmuxd, and libimobiledevice.
libimobiledevice is now at version 1.2.0, which means gtkpod should now support iOS 8 devices, including the latest iPhone 6/6+, iPad Mini 3/Air 2 and Apple TV 2G/3G. Although for music-sync to work with these newer devices it's necessary to install an additional "libhashab" file. See the "Special Requirements" section below for details. This situation applies to these models:
> UPDATED April 06 2015, to include the latest underlying libraries - libplist, usbmuxd, and libimobiledevice. libimobiledevice is now at version 1.2.0, which means gtkpod should now support iOS 8 devices, including the latest iPhone 6/6+, iPad Mini 3/Air 2 and Apple TV 2G/3G. Although for music-sync to work with these newer devices it's necessary to install an additional "libhashab" file. See the "Special Requirements" section below for details. This situation applies to these models:
> - iPhone4/5/6
> - iPod Touch 4gen, 5gen
> - iPad 3gen, 4gen, Air, Air 2, Mini 1/2/3gen
> - Nano 6gen, 7gen
[0] http://www.murga-linux.com/puppy/viewtopic.php?t=94022