I don't think you need to spoiler it... it is a public trailer after all.
I'd like to speculate the following about They Are Not the Survivor's They Think they Are
1) They are all dead and this is the afterlife (highly unlikely)
2) There are other survivors from Flight 815 on the Island (Boone, just before the plunge, spoke into the radio, We're the survivors of flight 815... they he hears, WE'RE the survivors of Flight 815, I think they are contacting each other)
3) Are the survivors of some other flight... they boarded the wrong flight (based on odd numbers on the Oceanic Airways website)
4) They are not just random survivors. They have been brought there for a purpose.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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