Popular fan theory says he will get some kind of Ironworks arm. Or perhaps they could - and this is a long shot - adapt Allagan technology and create some kind of biomechanical replacement. The likelihood of that is slim, but it's fun to think about at least.

Lastly: Moar Edda please. Not perhaps as some creepy ghost mage boss, but something more. It's my personal theory that Edda has the Echo, but never knew it, and thus trandscends death. The poor girl deserves some kind of redemption.