Good find. I'm also not thrilled with that move by Google. I'm sure it's great for some people, but not for me. I don't even like to post reviews as it is already, but this is a pretty big deterrence.
Having a review associated with a real-world identity will surely change the types of comments, but in what ways, I can only speculate.
I wonder if this will be a permanent change or something they'll reconsider at a later date.