At this point in time, would you know if activation of the physical copies both (a) non-backer copies and (b) backer copies will require Steam? I assume Paradox will also cover distribution of backer copies.
While the information may not be on hand right now, I have a feeling it would be a good idea to add in a pre-release FAQ, given people's experiences with recent releases. Mostly with regards to non-backer physical copies, e.g., does it require uPlay, does it require Origin, does it require Steam, is it one-time activation, are you redirected to an Obsidian portal to choose which one to take ownership.
I'm sorry, I was generally the FAQ-maker at work so it's a hard habit to break.