A preview embargo on a game that was funded by backers solely is not what i would call a show of good faith by Obsidian, they could either send the info they have to the backers first or they opt to cater to the usual publisher run press cycle, guess they went for the second choice.
Conveniently ignoring that they /have/ sent info to the backers first many, many, many, many times over now, and that their stated goal for gameplay footage (E.G, a good one) to release for the backers make perfect sense.
Wantign Obisidian to give /nothing/ to the press is weird as hell, especially as so before that every other Kickstarter studios had given more exclusives to the press than they did (and, yes, i am including W2 in this).