Rep is wiped because the rewards are bought with marks of honor or, I think, honor points, depending upon what they are. I remember blizz saying during some of the previews a few months ago that the rep rewards would instead be available anytime, and you'd just need the points to buy them. I think that means the armor would cost honor points, but the AV mount probably just costs AV tokens. And who knows about the stuff like alterac water or the BG-specific bandages/potions. I think those may actually be removed altogether, since they're going for a no-pots/bandages/any outside buffs or items in pvp approach with the arena. The reason I'm not sure about it is, they just said "it'll cost points," and that's vague enough that it could mean honor tokens for winning in the BG, or it could mean honor points from general pvping.
God, I really shouldn't have rolled on a pve server when I went from beta to retail. I did/do like pve servers a little more (just because ganking gets annoying and carrying out "revenge" on other unrelated lowbies doesn't do away with how annoying it was for me) but world pvp was so fun, and it definitely makes you a better WoW player no matter what they say, just because you're on edge and tend to have to learn the limits of your class sooner, and the limits of other classes as well. Sorry for the sidetrack there, I was just thinking of how awesome Nagrand and so on will be in the expansion... hopefully it's still going to be very active on Kilrogg.
And I've shelved my 60s, but I noticed some stuff: Blizz has updated talents again, at least for warlocks, paladins and shamans (didn't really look at anything else) and shamans got some nice buffs, while warlocks only got one nerf (unholy power remains the same). Paladins got a slight nerf on crusader strike - no change to the damage done or anything like that, just that the cooldown's 10 seconds instead of 6. I'm really dumb though, I didn't realize they made shadowfury a targeted aoe after they gave it a cast time. That's ****ing awesome and I'll be using that quite a bit more than I thought I would now. Anyway, the shaman changes are so good I'm seriously tempted to grind mine up to 70 at some point in the expansion. Maybe after I get my warlock to 70 and I'm in the mid 40s or low 50s and need a change of pace with my pally (though, tbh when I get him to the low 50s I'll be having fun with crusader strike). For now, though, I work on my huntard whenever the mood strikes me.