Being the RPG enthusiast that I am, even though I desperately want this game to be freeroaming (which would've made it hotter than hell in anticipation), the realization of linear movement, really, is not all that bad. With the way you can mess with the objects and scenery for various things (I can imagine moving forward to a PUZZLE WALL, where you have to rearrange things with the wiimote, using the "forceps" button combination of A+B), they could still do a lot besides just fight enemies and shake bushes. I mean come on, they're not going to make it "one way or the highway", you can see that there are various paths to which you can take, meaning you'll have to go down one way, fight enemies, grab a key, go back to the main path, and go back down the hallway to the locked door, fighting more enemies (or possibly a boss as you try to unlock the door) along the way!
Also, this game looks GORGEOUS.