After the version 1.1 update, the main story Archon Quest Chapter 1: Act III - A New Star Approaches will become available. You need to be at Adventure Rank 35, and complete the previous Archon quests to unlock this.
Coming with the update as well is the story quest Monoceros Caeli Chapter: Act I - Mighty Cyclops' Adventure! This quest focuses on Tartaglia's story. You need to complete the previous story quests, and use 1 story key to unlock.
The Story Quest Historia Antiqua Chapter: Act I - Sal Flore will become available at a later date.
"Childe" Tartaglia will become available right after the update, through the new event wish banner. He is a 5 star Hydro damage dealer that can go from ranged attacks with a bow, to going melee with water weapons. Coming with the new banner is the character trial, so everyone can try them out before committing to the summons.
Diona will also be available right away in the same wish event banner as Tartaglia. She is a 4 star ranged character with a bow that uses Cryo attacks to gain a shield, and has the ability to heal in an area.
*The characters "Vago Mundo" Zhongli (Geo) and "Blazing Riff" Xinyan will appear in a subsequent event wish.
2 new weapons exclusive to this event wish will also be released: Memory of Dust (Catalyst) and the 5-star weapon Skyward Harp (Bow). The duration of this weapon banner is the same as the character banner.
*The weapons Vortex Vanquisher (Polearm) and The Unforged (Claymore) will appear in a subsequent event wish.
3. Reputation system
Reputation is a new feature in the game where you can level up the cities through various tasks. Levelling them up will give rewards like blueprints for new items, or new food recipes. This feature will unlock Adventure Rank 25 and complete the required quests for the respective city.