Jumping to conclusions is all the internet is good for these days it seems, especially on gaming forums. "Oh no it's heavily scripted!" of course its heavily scripted this piece of the gameplay was carefully chosen by the devs to show off the new features in the game to the public, which I may add it is completely up to the player whether or not to use them, I know I sure as hell won't be using the "detective mode" or whatever its called because I like the extra challenge, so of course they would choose a part of the game with a variety of scenarios within to showcase the different situations where they would be useful.
People also should take into account that the devs can manipulate the game into doing certain actions like alerting different phases for the purposes of a gameplay trailer or demo. This may not be the case and I may be proven wrong when the game is released, but maybe instead of being linearly scripted, when we get our hands on the game the video above is one of many different outcomes for this mission which changes by the actions we take, and the scenes we see will look scripted as well.
Who knows, does this game even have a release date yet, what we see now may be vastly different in the months to come. Or maybe not, maybe the game is this heavily scripted and whatnot, I'll be sad to see one of my favorite stealth franchises moving in a different direction, and if this is the case hopefully the devs actually listen to fan feedback after that game is released and any future titles will go back to form, and if they don't listen to the fans they'll surely listen to the low sales figures.