I took some notes of stuff from the video while watching. Hopefully I heard everything right.
DLC4
- Male Human Shifter from Old Sarkosis (Romance option)
- Joins in Chapter 1, but can later join in later Chapters
- Need to be in Chapter 2 to start romance
- Adds a unique location
DLC5
- Part 2 of 3 part story (3rd part in potential 3rd season)
- Take place during march on Drezen
- Has a focus on crusade from soldier's perspective
- Work for Anevia as a scout
- One of the two companions from DLC2 will be sidelines but still play a major role
- 2 starts depending on final choice in DLC2
- Can fight the ice demons
- Will run into something above your paygrade for the Knight Commander to deal with in main campaign
- Kingmaker Secluded Lodge inspiration for parts
DLC6
- DLC6 is still early in development, so even the devs don't know many details right now
- Swarm probably won't get much (if anything) in DLC6