Now, the first sign of N'Zoth's power that we're going to witness first hand are Assaults by his minions, on two key locations in Azeroth that are home to Titan facilities. Now these Titan facilities are our world's last defense, our final bulwark against N'Zoth coming completely into our world and plunging it into madness.
First off: Uldum, home of the Halls of Origination, great titan vault, is going to come under regular assault by the minions of N'Zoth. When an assault is active in the zone, players will rally to Uldum and battle across the zone against the Old God's minions.
Another key location that is home to a major titan facility is the Vale of Eternal Blossoms back in Pandaria - Mogu'shan Palace* is what I'm referring to, of course. Now, last time we saw the Vale of Eternal Blossoms, it had been blighted with dark Sha energy unleashed by Garrosh towards the end of Mists of Pandaria. Now, the passage of time, hence, the natural of redemption that came in the end of that arc has finally healed these old, old wounds to the land, and the Vale stands fully restored to its original glory, all players to visit in this next content update.
*Transcription note: Ion had originally mention Mogu'shan Vaults but those are located in Kun-Lai Summit, so it's been fixed to the instance in Vale of Eternal Blossoms.
At least, till it comes under attack by the minions of the the Old God, and it's once again plunged into a new type of darkness. Don't worry, its only going to look like this as long as N'Zoth is actively attacking the zone. Otherwise, in the long run, the pristine Vale is here to stay.