This is the only game recently that I'm considering buying as soon as it is released, and I haven't done that since Majora's Mask on the N64. I adore the original, wonderful art style and a PC port that was polished and required peanuts to run at 60fps. Dunwall for me is as good a game world as Bioshock's Rapture.
I hope the plot moves away from "angry wronged man seeks revenge, again" and we get even more of an insight into that games world's settings, politics and societal structure while retaining the "play as any style as you want" from stabby stabby to avoiding everyone and skulking in the shadows.
The only game I'm hyped for about for at E3.