Old Azeroth: Here’s XP. Here’s more XP. You still here? Here, a few free levels, get to the Dark Portal already!
Outlands: Welcome, here’s your flying mount. Have some fun, but hurry up, the ship leaves tomorrow at 9am from Stormwind Harbour.
Northrend: Greetings. No, you can’t fly here (unless you have a 78+ character already). Now, to the ground, and get working, baby. And none of that “one level per day” crap for you any more!
Nothing surprising here, but still a bit of a shame, that it takes a new player about 3 months to reach the content which is “the game we are supposed to play”. A Cataclysm is overdue indeed.