The Xenoblade Chronicles 3 Expansion Pass includes access to multiple waves of DLC content as they become available.
The planned release timing and details for what each wave of DLC includes are as follows:

DLC Wave 1

Release date: 7/29/2022

This wave of DLC contains the following content:

• Consumable items: Silver Nopon Coins x 30 and Gold Nopon Coins x 10
• Accessories: Iron Temple Guard, Circlet of Wisdom, Silver Belt, Glass Memory, Nopon Strap, and Auto-Balancer
• Color variations for existing outfits

*Note that the helpful items above can also be acquired while playing the game

DLC Wave 2

Release date: 10/13/2022

This wave of DLC contains the following content:

• Challenge Battle mode against difficult enemies - Overcome a variety of challenges by playing the Challenge Battle mode. Collect crystals and exchange them for valuable accessories and new outfits.
• A new hero character and accompanying quests - This wave adds the new hero character, Ino, to the game. Complete her Hero Quest to recruit her to your party and gain access to her class.
• New character outfits - Swimsuits

DLC Wave 3

Release date: by 4/30/2023

This wave of DLC contains the following content:

• Challenge Battle mode against difficult enemies
• A new hero character and accompanying quests
• New character outfits

DLC Wave 4

Release date: by 12/31/2023

This wave of DLC contains the following content:

• New original story scenario

Stay tuned for additional details regarding individual DLC waves.