Here's a little information about the new Episode which includes Rachel City.

The holy words of the goddess Freya brought great changes to the lives of the indigenous people living in Rachel: they swore to honor and adore her, creating an immense temple as her house of worship in their small, simple oasis village. The faith and fervor of Freya’s followers in Rachel proved to be infectious, and the entire nation of Arunafeltz eventually converted to this new faith. Religion became central and foremost in the hearts and minds of the people, naturally merging with Arunafeltz culture and government, and Rachel developed into a major, influential city.

Some New Quests:
Get a chance to have random unique item rewards if you donate zeny to Freya’s Temple for lottery tickets.

Find the Sincere Follower, Ustialla. Talk to her and agree to help her. She will give you the Ashy Necklace and discover the mystery behind it. Completing this quest will enable Ktullanox (MVP) to be summoned and fought by the player.

For this quest to be available, 500 million zeny must be donated to the temple per server and must have also completed “The Wicked Delivery Quest”. Talk to Nemma. She'll mention how the automatic security has her locked out. Help her rescue her sister trapped inside. Completing this will enable access to Rachel’s Holy Sanctuary (Dungeon).

You can see a very nice detailed guide by Freestyle on the AnthemRO forums located here.