Okay, so whether you go to Hyjal or Vashj'ir is just personal preference, but which one takes longer to complete?
Vashj'ir. No doubt about it. I personally like Vashj'ir much better than Hyjal, but it's not a zone you'll be leaving quickly. The achievement, even if it is bugged to display too many required quests, would still ask more of you than Hyjal. Vashj'ir is wonderful, but you're going to be there for a while if you want to complete it before moving on.
An interesting note: Vashj'ir used to be even longer, during the closed beta. Those of you who have finished the zone and did the little quest chain with Budd Nedreck, where you smash his treasure, will remember -- that used to be Harrison Jones. The quest chain was much, much longer. You parleyed with the gilblin nobility instead of killing them outright, and it felt more like an adventure than comedic relief. A lot of the zone was streamlined like that. It was unfortunate but necessary. Vashj'ir was huge.
Do you need to buy Cataclysm if you want to train archaeology?
Anyone know how bad it would be to fly over one of the enemy faction's main cities?
I wouldn't recommend it. You'll get blown out of the sky and die a very unfortunate death. If you don't like repair bills, stay out of enemy air space.
When is the next expansion coming out?
It will be announced at BlizzCon 2011. Everybody will expect it to launch in early 2012, but it won't launch until the end of 2012. Probably.
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