It's very different. Some of the little "Simon"-esque sequences can be too long, but the story-driven gameply has me hooked. I am about 90% of the way through my first playthrough, and so far this game is looking at an 8/10 from me. Hopefully that will rise on consecutive playthroughs, as I am going to do everything in the exact opposite way I did before, just so I can see exactly how much the game changes based on your decisions. If it doesn't change much, then I have to admit that I probably won't play it through again. But, if it varies greatly, then more playthroughs are sure to come.
Let me know if you know anything about how much IP can change, and let me know what you thought of the game. If you've played it, that is.