While no more major patches are expected to hit World of Warcraft before Wrath of the Lich King is released, we'll probably see quite a bit of tweaking between now and then. The next patch due for the service, numbered 2.4.2, makes some major changes to the way that Arena battles rewards PvP players. Previously, members of an Arena team were rewarded with Arena points based on the overall rating of their team. IE: if the average of the team members was 1900, and each team member participated in enough fights, everyone on the team was rewarded Arena points as if their rating was 1900. As of the upcoming patch, that's no longer the case.
Individual Arena ratings will now be taken into account. According to Blizzard Community Manager Drysc, "if a character's personal rating is more than 150 points below the team rating, they will earn points based on their personal rating instead of the team rating." Individuals will no longer be able to 'float' their way to large amounts of Arena points. Arena gear previously required just a certain team rating, but with change that rating will also apply to a character's personal Arena rating. If a team's average Arena rating is more than 150 points below the team rating, they'll be queued against appropriate opponents. This will prevent individuals from quickly improving their personal ratings through individual matches. And finally, "If a team does not enter an arena match that is starting they will lose points equal to the amount that would have been deducted if they had played and lost." This will work to prevent teams from abandoning matches until they compete against a group they are specifically looking to fight.