In a stunning (not really) move, Blizzard has announced that players will have to purchase a Flight Master's License for 250g. This skills allows players to fly on Kalimdor and the Eastern Kingdom continents, including the new level 80-85 zones, and is trainable at level 60.
Previously, during the Twitter Dev Chat in April, the developers responded that more than likely, players would be able to fly from the beginning without purchasing the tongue-in-cheek "Old Weather Flying." As for why Blizzard is now adding such a skill, I have no idea. I don't mind ponying up the gold, considering the rate at which gold is earned in Cataclysm feels much faster than in the original game. My best guess is that Blizzard still wants flying in the old world to feel special and be a goal players will strive to reach for rather than stumble across. Also, it appears that if you do not have the Cataclysm expansion, you will not see this ability as trainable -- if you want to fly in the old world, you'll need the new expansion. What do you think about the Flight Master's License?