I was honestly surprised and enjoyed this, I'm hoping they show an open-ended level though. Pretty much everything from Blood Money is there, just fine-tuned and better looking with more cinematics and linearity. My hope/belief is that it's the opening/training level, which would make a lot of sense considering the events of the last game and that most of the other stages will be your traditional assassination levels. My only real complaint is that "precognition" thing to see where people are going, which I think may be exclusive to rookie or normal difficulties and even then it's probably going to be optional to use it anyway so I could easily just not use it.
Blood Money's opening and end levels were both linear after all too.
