PvP in the Burning Crusade?

By now, I imagine everyone's aware that the Burning Crusade expansion will allow players (who have purchased the expansion) to level up to 70. However, what this will mean for the game's PvP system remains a bit vague. At present, a level 60 player receives more honor than a lower level player for kills. If the existing system is simply stretched out to level 70, then players at level 60 (who do not own the expansion) will find themselves at a detriment if attempting to compete in the PvP honor rankings. To me, at least, this implies that those players without the expansion won't have hope of keeping up with those who do own it – despite the fact that all will be able to play together on the same servers.