Hi,

After rewatching TLD last night, I realized the opening shot of the gun firing and the transition to John lying down was not from Norbury shooting Mary in TST but the ending shot of Euros shooting John.  It reminded me of how TST opens after the credits with Sherlock walking through the London Aquarium which is sort of how TST ends with them capturing Norbury at the aquarium.  If the pattern holds for The Final Problem, there could be a clue in the opening to how the episode will end.  Hope this helps your viewing party speculations.

Sorry to post and dash like this but I'm on the West coast and don't want to be spoiled before the PBS broadcast.