The person who wrote the Pilot summary did say:
It starts with the destruction of Storybrooke, everything is in chaos (Like the last 2 episodes of Season 2)
But could it be possible they sorta generalised, and it was actually chaos caused by the Wraith? I mean, you’d think that if they likened it to the end of S2, there were probably plants invading the town, but they don’t specifically mention that. Given that we know the Rabbit is opening a portal, it would make more sense IMO if that’s happening immediately after the Curse has broken and magic is back, because it’s the first opportunity the Rabbit has to get through to SB to find the Knave. Emma was sorta busy back when the Wraith was destroying the town too, I guess, but still, the t-word might fit better that way?
We need a JMo costume description to confirm the time.