"I've never done the 'Grand Theft Warren' game, you know? I don't make sandboxes; I'm a big believer in linear narrative. So every player's going to accomplish the same big mission goals, but it's how you get to that goal that's unique to you... I'm kind of an old dog. I don't learn new tricks." - Warren Spector

Spector also had some praise for the Wii in general, and seems to really enjoy working with the platform.

"...if I never make another game that's trying to be the hyper-realistic, look-like-everything-else-in-the-world game, I'm ok with that - I don't need to do that anymore. I'm really enjoying working on a platform where gameplay is it."

Link