I finally did it. Paragon 100!!! What a journey its been. I know a ton of people are already there, but it feels like one hell of a accomplishment. Not only that, but my luck took a turn for the better a couple weeks ago and I finally rolled an awesome ammy for my wiz.
Beyond current paragon level 60 the delta-increment for gaining a new level is greater than the previous.
So, from 1 to 60 the delta is 1,440k XP.
From 61 to 70 the delta is 2,880k XP.
From 71 to 80 the delta is 5,040k XP.
From 81 to 90 the delta is 6,480k XP.
From 91 to 100 the delta is 8,640k XP.
The total XP needed for P-100 is 10,454M XP.
On RoS, the total XP needed for P-100 is 7,848M XP, and the delta is always 1,440k XP, until they reach the limit of an 32-bit integer (which is 2,147,483,647 XP - ~2B - per new level, or about paragon 1487).
A friend of mine (dac#1815) kindly did the graph below to show the difference on smoothness between D3 and RoS:
The blue graph is current D3 progression chart. The orange one is the new RoS progression chart from 1 to 100 paragon.