If there's a flash forward several years into the future, then one of the unexpected couples could be Lily and Cyrus, Eleanor having sadly died.
We know the wedding won't go off without a hitch, because the police will put in an unwelcome appearance. However, the promo pictures suggest they'll be too late to stop the wedding.
If Nate and Sage are right, and GG was Serena's "guardian angel" in the first two seasons, then GG has to be Dan, Eric, or at a stretch Jenny (or Nate himself, but in that case the scene is pointless).
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