This is a rough comparison of the required cumulative XP to reach a certain level before and after the lv 80 update. Note that the green curve (exponential fit) is approximate since we only know the new XP requirements for level 10, 20, 30, etc. Also, I suspect the true leveling curve will not be a pure exponential but rather some piecewise function (e.g. quadratic for lower levels, then exponential for higher)
(Thanks to /u/Daze_SC2 for the quick exponential fit: New XP for levels 10 – 80, exact data and exponential fit : TheSilphRoad)
by nn42