There will be an adjustment to the XP table on next update. Nothing big, and in the end it takes the same XP to reach level 20, but it should make the progression more "even". The changes will apply retroactively, so you might find out you gained one level after updating (or not, depending on your level).
This should be particularly noticeable in levels 7-12, which many new players find too steep and in many cases they are right. When you are level 6 you are still probably killing the same stuff than when you were level 5, yet in the old table you needed almost twice your current XP to reach level 7. I think it's more logical now.