In , the XP needed to level (from 80 to 85) jumps again.
The below 81-85 XP Values are form the beta and forum posts.
Lvl Max XP
80-81 1,686,300
81-82 2,121,500
82-83 4,004,000
83-84 5,203,400
84-85 6,546,500
Tot 19,561,700
from link below
http://www.wowwiki.com/Formulas:XP_To_Level
Im just about to pop 83 and these values are spot on