Over on the official World of Warcraft forums Blizzard has revealed some important info on how the upcoming 2.3 patch will make advancing to level 60 a bit easier. The most notable change will be a reduction in the amount of experience needed to increase each level from 20 to 60 by around 15 percent, allowing for faster progression through advanced levels. When the change takes effect, characters will remain at their current level percentage. So if you've already made it half way to your next level (between 20 and 60) you'll still be half way there after the patch is implemented and the amount of experience reduced.
To facilitate leveling up even further, Blizzard is increasing the amount of experience received for completing quests between levels 30 and 60. The increase will become more substantial as players approach level 60. Several outdoor elite-mobs are being demoted to non-elites, making them easier to defeat for solo adventurers but offering the same rewards. Blizzard says Stromgarde Keep in the Arathi Highlands will become a solo-friendly environment once patch 2.3 is made live. For players looking for more quests in the 30-40 level range, 60 new quests are being added to the Dustwallow Marsh. Look for more changes to be announced in the coming weeks.