Experience across the levels has been leveled out, apparently. Certain levels used to happen much faster, and some much slower, now they've adjusted it so levels are gained in a more consistent manner across the full leveling experience. Overall XP requirement has increase by 10%, but so has the quest exp amount. Mob HP increased, heirloom gear very minorly nurfed to be closer to similar level blues. It's probably not going to make that huge of a difference. Maybe an extra day? It took me two weeks to level to 110 on my priest without ever doing a dungeon, and I was constantly jumping from place to place. It'll be very nice now to actually get to finish storylines.