I have been formatting an external drive to use with LUKS encryption for over 24 hours now (5TB external). There is no indication of the progress of the operation.
I'm not sure what's required, but GNOME seems to think a bug should be filed with udisks to fix this problem.
>>All the interfaces for this are in place
>>what is needed is "just" to hook up udisks to use it. So closing NOTGNOME.
A bug was reported with GNOME for gnome-disk-utility here: https://bugzilla.gnome.org/show_bug.cgi?id=605085