Not completely right i was in Novo last night 2 ppl there, maybe wrong time?
Majority of the population are still from Europe and such, when you posted this it's about 4-6 am for most of us. In Avarice we still had about 10 online (got some western players recently), so I imagine other guilds have some folks online as well.
Even most of the western players are also trying to adjust to EU times, because that's usually when dominions, raids, BGs, astral happen.
That being said, it's obviously early after patch, the numbers are definitely going to drop soon.