In patch 3.05 a new pvp map will be introduced, so get ready to join the grand Companies of Eorzea for the battle the island of Seal Rock!
There will be 3 different spawn points just like the Frontlines, however at the start of the match it will randomly choose 1 of the 3. This way there is more variation in the every match. From what i understand so far the game is kinda like capture the flag. There are Allagan Tomeliths that have data in them which you need to retrieve, there are 3 differents ranks: B, A and S. Higher ranks off course give more points, you can also gain points by taking down members of the enemy team.
Rank B

Rank A

Rank S

For more info go to the Lodestone
http://eu.finalfantasyxiv.com/lodestone/topics/detail/c932e207bde3c01dfb22faf6af9bf6089d437f89