WARNING: this is a spoiler discussion.
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So far we learned back in 2.X era that....
Omega is located in the Borderland Ruins. Sealed deep underground while the defense system of the area attack anyone PvPing there to gather the Allagan Knowledge.
The new PvP map revealed the Legendary Island called Sealed Rock told by Limsa citizens to be the place where the Great Serpent that guards the Legendary Treasure is but in reality....
the Island is a Lost Allagan Weapon Testing ground used to test Omega and other Allagan Weapons with the great treasure actually being Allagan Technology and Knowledge but these is no sign of the Great Serpent.
So far both GC PvP maps have been related to Omega and seem to be building towards Omega's story in FF14.
What do you all think this may lead to?