Ok I guess I gotta check which DLCs are free and which are not. I have another question then - why cannot I buy them? :) And more importantly which of the Dlcs are part of main campaign and which are completely standalone? From what I can see, only the midnight isles dlc can be accessed from the main campaign, right?
They will become available around 4 pm UTC.
DLC 1 is a "five minutes before the final battle" side adventure, DLC2 is a separate story with results having a minor impact on the main campaign, and DLC3 provides a separate roguelike mode and some dungeons for the main campaign.