WOW - Patch 2.3 cuts leveling time by 15% : World of Warcraft General Discussions

Patch 2.3 brings a lot of new content and features to the World of Warcraft. One of these is the highly anticipated increase in leveling speed for players pre-60. Blizzard Europe's Vaneras took a few moments to share with us some of those changes.

The first notable change was to simply reduce the amount of experience needed each level by approximately 15% between levels 20 and 60. Experience gained for completing quests (on average) between levels 30 and 60 is being increased. We've also added approximately 60 new quests in Dustwallow Marsh. We're making other improvements to pre-bc leveling dungeons that players will likely find most agreeable. We also want to make running a leveling up dungeon more worth while. In addition to increasing quest experience for dungeon quests, we're also upgrading all pre-bc dungeon boss drops to blue quality items.

...

is it undetectable by blizzard?

@ the second post nice spam

@ the third post, this it a patch update from Blizzard, It's just to make it easier to level from 1 - 70. It's not a cheat/hack.