Ancient superproject like the Deep Roads/Firewine Bridge?

[Chaos Theory]

The first time I stumbled upon Firewine Bridge in BG I was awed at the scope and majesty of the previous race(s) and what they were able to accomplish. The bridge suggested a sprawling network of roads spanning the now extinct empire. This idea was further explored by the Deep Roads created for BioWare's Dragon Age-- an ancient superproject of almost unimaginable scope. It was clear that everyone in Ferelden knew of this epic network of underground highways, but few had ever ventured into their depths.

 

Has there been any hint by the devs that PE will have a similar mega-structure that has survived the eons? I see that the "Ruins of Eir Glanfath" may be a candidate, but it seems to me that this, rather large area is more a collection of ruined settlements, much like the Mayan ruins of today (Chizen Itza, Coba, Tulum, etc).

 

What other ideas could be explored, without outright stealing the concept of the Deep Roads?

Edited October 15, 2012 by Chaos Theory