I'm not entirely sure how to feel about this. Watching the video linked earlier I'm both disgusted and intrigued. Sam looks more like an assassin rather than a spy now, and I like assassins. I don't know the premise of the game, but reading the comments I can draw the conclusion that he is out to kill someone (or everyone). So I suppose the new gameplay would fit in with the story.
But also, having played the older games quite a lot back in the day, I don't like this at all. While this certainly looks better, from a 'cinematic' point of view, I'm not sure if it'll feel better, you know? I for one loved sitting around in the shadows, watching every move the guards made, and when I had a plan down, I executed it and mostly got through perfectly. I doubt I can get the same out of Conviction. But I suppose that's nostalgia for you. I recently bought the first SC from Steam, and I couldn't get anywhere due to me wanting to take it at a different pace than was intended. Granted, with a bit of training I could probably get into it again, but I don't feel like doing that anymore.
That said, I'm not buying any Ubisoft products anyway, so all this is irrelevant.
Still, I wish they hadn't done this.