Aion 5.0 will go live in Korean server today and the game has released a launch trailer from where you can see the essential feature in the update - the ability to become High Daeva. The path of transcendence will be tough but the reward is high. On the other hand, NCsoft releases the Patch 5.0 OST, and you can listen it here.
There's no release date for the western version but no doubt the update will be available in the NA and EU server after it releases in South Korea.
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Aion 5.0 New Trailer Highlights Key NPC Responsible for Daeva Advancement