Originally Posted by JonNik
Edit: Btw, the email from GMG mentions a voucher for Risen Isle bonus (the DLC I guess) to be used during checkout… Is there a checking out step in activating a Steam game via the key they will send me on release ? (never done it before)

For myself, I got the Steam code in my order email, and I can use the 'Add Game' function on Steam to add it to my library, which will validate and activate the game and tie it to your account. It mentions 'bonus' in the email … so I only assume the DLC is included with the key. That has been my experience with games activated through Steam.