G4 has 3 videos up on their site that explain more in depth the benefits of the upcoming expansion for World of Warcraft.
Some of the features they explained were more on the Archeology profession – turns out this is a secondary profession so it can be learned in addition to the main two Professions, however the way the video put it, it is mostly a way to get additional Lore information and learn more about each race in Azerroth. Still this is a cool thing to do when you have nothing better to do.
Of course there is going to be other huge changes with the expansion some of which sound very interesting, the Lead Content designer (last video on that page) mentions so much audio being included that they almost can not fit it on 2 DVDs. It makes me wonder if they might release a Blu-ray version of the game for those with the proper drives, at any rate sounds like Cataclysm will be 2 or more DVDs otherwise.
With regards to flight in Azeroth they seemed tight lipped as to just what would be required to be able to fly in the Classic Zones but the way it sounded is there will be no additional requirement you can just do it, provided you are the right level and have bough flight in the past expansions.
At any rate this is a short post but wanted to get the word out, if you are even slightly interested in the expansion I suggest checking out the videos they are all about 6-8 minutes long and there are 3 of them.
The link above will take you to the G4 site that hosts the interviews.