Yesterday a player on the official WoW forums asked if they'd still be able to attain the title "Champion of the Naaru" once patch 2.3 goes live. Eyonix answered that, yes, the title will be rewarded to any players that complete the necessary quest line, whether or not those quests are finished before or after the patch's release. He did warn that the title will probably not be given to characters that complete the quests after level 70. If you've been waiting for the next expansion to breeze through the requirements and easily pick up your title, you'll likely need to rethink your strategy.
If you're unfamiliar with this epic quest line which was once required to enter the Tempest Keep raid instance, it all begins in Shadowmoon Valley. The very first quest is called "The Hand of Gul'dan" and can be picked up in your faction's main town of the zone (Shadowmoon Village for Horde and Wildhammer Stronghold for Alliance). About 25 steps into the chain (I told you it was epic) you'll unlock new quests from A'dal in the center of Shattrath. For many players this is where the challenge truly begins as you must venture into four of the more difficult heroic instances to complete these quests. The final step involves killing Magtheridon in a 25-player raid, after which you'll finally be deemed a "Champion of the Naaru". Good luck!