I hope not.
The most I'm expecting from Raubahn is a special guest appearance in the next Deus Ex.
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I'm kind of surprised they didn't just slap all of the old quests in an Echo.
Seeing Nanamo during the Culinarian questline would have been no different than running around Ul'dah in 1.0 with Minfilia as a little girl.
Granted, we can just pretend that is what's going on, but polish like that is the kind of thing I'd expect from SE, or any major developer (who isn't Bethesda and instead content to lump that on the modding community).
On the theory that Ilberd is Gaius, I just dont believe it. Maybe Ilberd thought that the strategy that Gaius used in his city-state was really good and did to Uldah.
I dont know I just really think Gaius is dead :p