Considering this is only the studios fourth game release. The prior three being two games that were okay, Bioshock being the other, but they only did the design on, has a lot to do with the graphics, use of DX9, compatibility and relative ease of porting to consoles. Money, money, money.
I am sure with the success of this game, and revenue it brings in, they will step forward if they decide to make a Dishonored II, and up the graphics, game engine and all that good stuff. Which hopefully doesn't devalue the gameplay.
That said, I went over to my brothers who rented this, and I checked it out. So I got me a copy on PC. Got through the first mission undetected but I failed to get ghost cause apparently one unconscious body was spotted. No idea how, I hid them all very well and it took me about an hour and a half to do the mission by waiting patiently. Really irked me that I didn't get ghost. I almost want to do it again, but that just took way to much time.
Fun game though, from what I have seen so far. I'm not sure that it lives up to the reviews and hype it is getting, but if you have extra cash, I'd recommend checking it out, or waiting for a price drop.
Also, it is touted as steampunk... But everything runs on whale oil... Which means it is not steampunk. But I get it, with the "steampunk" vibe and all.