Gamespot has the story, must have got a preview before the conference:
http://www.gamespot.com/e3/e3story.html?sid=6149677&pid=928517
http://www.gamespot.com/e3/e3story.html?sid=6149677&pid=928517
While all of the above is pretty much how you'd expect the control to map out, the grapple beam is a cool use of the controller's unique attributes. In the demo we came across objects that featured the beam icon above them, handy tip off to use the beam. The mechanic for the beam was pretty cool. We had to lock on to the object then fling the nunchuk which caused Samus to fire a beam out at it. Once we had it on our line we used the analog stick to pull it back towards us. Once the debris was cleared we had our chance to engage in some morph ball puzzle solving that was initiated with another use of the controller, simulating Samus' hand manipulating a switch. We "grabbed" a handle, pulled it back, twisted it and pushed it back into a socket with a fair amount of precision.