SPOILERS BELOW
Think about it for just a minute. Have you realized how often Alisae and Alphinaud make plans and do whatever it takes to bring them to fruitition and have the WoL do their bidding? A hypothetical question I pop you. The voice, likely WoD Voice, states Twin Calamities. Could it be related to the Levillaur Twins such as they'll do something really stupid on their own and cause a calamity? I don't think they're mentioning anything related to the other shard that was already destroyed according to the WoD ending in I think it was 3.5. So, what if Alisae and Alphinaud were actual villains and they've been orchastrating everything from the start of the Wagon Ride to your respective City State or Boat Ride if you started in Limsa.
I'm sure my question is completely out this world, but what if?