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ArenaNet has announced that a new PvP XP system will be implemented soon. All PvP XP will be available to all of a player's characters in an effort to give access to more tools.
With all of this in mind, the system is receiving the following changes:
All earned World XP on an account will be put into a single pool.
The sum of those points will determine the world rank and World Ability Points available to each character on the account.
World Ability Points can be allocated differently on each character; you are not creating a single, account-based, version of your characters.
With this change, we hope to still see that sense of uniqueness to different characters while providing much more value across all characters on an account.
Once the change is in, all World XP earned by each character on an account will be applied to the pool for that account. Rank up chests will be given to the character that earns the World XP that increments the account one world rank, much like daily achievement chests do currently. Retroactive rank up chests will be added to the bonus pool of any accounts that earn them via the World XP summing process.
Read more on the Guild Wars 2 site.