level XP
70 1,523,800
71 1,539,600
72 1,555,700
73 1,571,800
74 1,587,900
75 1,604,200
76 1,620,700
77 1,637,400
78 1,653,900
79 1,670,800
80

Its actually fairly linear as you can see - 1.5 million from 70 to 71, and 1.6 million from 79 to 80. Its a total of around 15 million XP I believe, whereas TBC was somewhere around 6 million I think from 60-70.

You get 20k xp/quest average, a good TBC leveling pace would net around 60k xp/hour (unrested) or around 100 hours /played, which sounds right - if you played 10 hours a day at TBC launch it took around 10 days to hit level 70, people who played 16 hours/day took 6 days.

WOTLK will probably hit around 80-100k xp/hour or around 150-200 hours /played, so a little bit longer - 3 weeks at 10 hours a day, 2 weeks at 16 hours. Some will do it slightly faster i'm sure.

Remember that Season 5 isn't starting until Dec 16th.