If I didn't get to your question today, go ahead and ask it again today, and hopefully one of the other WoW Insider staff in the Wrath Beta will be able to answer it for you. Thanks, everyone!
juicyjuice asked: As I understand it, the Argent Dawn is making a reappearance in WotLK. Will players who spent a lot of time with the Argent Dawn pre-BC have a significant advantage over people who may not have much or any Argent Dawn rep when WotLK hits?
The Argent Dawn and parts of the Silver Hand are now operating as the Argent Crusade. I won't elaborate on that so we can avoid any spoilers on the front page here. So no, high Argent Dawn rep from WoW Classic will not give you any advantage in Wrath of the Lich King. However, it will probably play a role in an achievement or two, though it is a bit too early to say for sure whether that will be the case when Wrath hits retail.