Unless it has changed since a couple days ago, the XP requirements for levels is already lower on the PTR than live. I got a couple of my mid 60s on the PTR and noticed that the XP to level went from something in the 700k neighborhood to just over 500k. I have a 60 I can drop on the PTR later and see if I can't get a better idea on the new XP curves.

- Souca -