These are Chapters 1-4 of Kingdom Hearts: Missing Link. Chapters 2 & 3 are brand new and were not in the 1st closed beta test.

Chapter 5 looks like it will be coming later in the Beta.

00:00 - Intro
11:10 - Chapter 1 - Drifter
18:25 - Chapter 2 - Tracker
25:46 - Chapter 3 - Society
31:20 - Chapter 4 - Astral Dimension

Meet the Baroque Society! They are the main group that you join in Missing Link, headed by Operations Master Nept. The other two members introduced to us are Freya and Remus.