In addition to reiterating claims of its accuracy and the importance of tactile buttons, Marks mentioned a few details that you may not have known about the controller. Firstly, he talks about the controller's analog trigger: "It has this analog trigger which really is a great metaphor for squeezing and grabbing. So you can grab and you can put as much pressure as you want to grab something with, which is really great for picking things up or for giving you the ability to just interact with the scene in a way that's completely different than we've been able to do before."
Next, he confirms that the controller will be able to rumble, much like Nintendo's Wii Remote. "It can give you some feedback about what's happening through rumble, which is very private and only you are getting." Private? We're not sure that's the best word (note: link slightly NSFW) to use when describing force feedback.