It sounds like I draw a stricter spoiler line than you do, in part because I have been unpleasantly surprised more than once by what marketing thinks is appropriate to put on the back of the box. ;) (Or on the book cover, or in the trailer, and so forth.) It also has to do, at least in my case, with wanting to err on the side of seeing less. Applying a zero-tolerance policy means that I will miss some things that I wouldn't mind seeing, but I'd rather that than accidentally learning something I don't want to know. So yeah, it would be hard to apply any kind of DA-free-zone with middle ground of "this kind of info is okay but this is not", because what falls where is so up to individual interpretation.

I definitely agree with you on the info being released not necessarily being spoilery in and of itself, but once people start applying any kind of analysis to it, it becomes way more so. I'm pretty sure I saw the marked-up concept art you mentioned -- that was one of the posts that led me to the tipping point of locking down my reading, along with the discussion of the new character announced in the Game Informer article.