This game immediately makes me think of two others: Wet and Velvet Assassin.
Now, I enjoyed Wet a lot. I still say there's no better game to play when you want to feel like an ultimate bad ass. That said, the game had a lot of problems. Velvet Assassin had a couple things going for it, but it fell apart around every turn.
So, no, I'm not that excited yet. Bethesda I love, but every other game they create is a failure (in my opinion). Oblivion was good, but Wet unfortunately not great. Fallout 3 terrific, but F:NV mediocre. By my count, Skyrim is going to rock... and Dishonored... uh oh.