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ravenmoon, @
Tanaria, @
Astranea
The confusion here is partly because we are not dealing with 1 kind of night elf in this current era or group.
Most responders here think of the night elves as the WC3 group and think of the race purely based on the geography of WC3.. but that's not what we are dealing with here.
When you talk of night elves, you talk about a race that has several groups, and cultures.
Any new night elf city, even one for the Darnassian group is going to have several kinds of night elves.. two distinct cultures are the priesthood and the Highborne - the groups are not the same, they share many things but they're culturally quite different. They were even different in the pre-sundering era, regardless of what the technology was. The druids and forest culture is another.
when it comes to cities, we don't' really need to include the forest culture, what we see in Wc3, and in the cenarion circle areas is druid culture, you won't have that in a city, they don't do cities. So night elf nation or peoples that have a city would have to contain the other cultures we know of the night elves. That is the priest caste, the Highborne cate. Because these are the night elves.
The long vigil period wasn't a new night elf culture, it was the priest culture from their caste but in a forest setting without cities, temples and the conveniences arcane magic/technology bring, the forest culture, was the culture the night elves all knew/had when Cenarius approached them and taught them to care for nature before they mastered the arcane and created cities..
None of it's new. Blizzard has a set definition for night elf forest, urban culture, arcane Highborne groups, priest group, druid group.
So 10k years later, when the Long Vigil ends, the Highborne return, the night elves that build cities or live in them would have that culture and aspect predominant in the Pre-sundering era (it won't be a new one, and as Raven said, it would be a culture with some different attitudes - like the arrogance/recklessness common in the invasion period would be absent, it would be more like they were before they got addicted/reckless - rather than something unknown)
this is because blizzard has defined the parameters , nature, culture, and set pieces for the night elves. They have their own set, architectures, environments, magics, cultures - and they have several,, because they are a big race.
You need to understand these to make good calls and predictions concerning them.