Xenoblade Chronicles 2: New Quests Pack 1

At the moment, the Xenoblade Chronicles 2 Expansion Pass doesn't have enough major content to be called a meaningful one. You're not missing out on anything substantial from not getting the expansion. Luckily, the more interesting contents such as new BLADEs, Challenge Mode and even a brand new story are promised to be released in coming months. I recommend that you wait and see what those promised contents would bring to the table first, before picking up this expansion pass.