OP updated with the latest details
"You sure, are in luck:
Next big update:
So it's saying that they had to change up their design philosophy when developing TW3, due to the open world structure. So NARRATIVE comes in three forms:
Lowest level = free form activities like crafting, monster slaying (seems to be much more extensive this time around) and questing.
Next level = Political situation of Nilfgaardian invastion is resolved through a core plotline for each area. These areas? -> Skellige, Novigrad and No Mans Land!
Final level = Geralt's main plot line, his search for his loved ones, and the chase of the Wild Hunt.
Sounds like a lot of interwoven plotlines, decision making. You can skip things if you really want, but there will be consequences to your actions if you do so."
@TheVoxelman on twitter