ArenaNet is pleased with the community embrace of World XP in Guild Wars 2's WvW and has announced that it will be making this XP account-bound in the near future.
"As we begin to roll out our new core horizontal progression system of continually-expanded skills and traits, we felt there was no longer a need to have a character-specific progression system unique to WvW," the devs posted. "The skill and trait system will provide game-wide horizontal character progression for all players."
When the change is implemented, every account will pool earned World XP, and that pool will determine world rank and world ability points. Players can then take those world ability points and dole them out to various characters as desired.