I have to admit, I have intentionally avoided information on Dishonored as much as possible so that I can go in blind.
That all ends today with this video that wraps up the Dishonored four part developer documentary, which explains some last minute design philosophies and gives a general overview of the game. In fact, if you haven't been following the series, you can probably skip the rest and just watch this one.
The crux of the video is explained wonderfully with the line, "I hope the players will feel like they are a supernatural assassin." Yep, that pretty much sums up the game! Hopefully it'll deliver.