I know that those here, who love change and new toys, probably won't like having the thread invaded by those who don't fully embrace the change. But, my initial reaction to the screenshots I've seen (I don't have access yet) was negative because of what I perceive as visual clutter and noise. I would tend to agree with +Lisa Miller
in that (as always) people are going to want more "control" of how the environment looks in their eyes and on their screens. What is pleasing to the eye for one person is not necessarily pleasing to another.
I am not a Facebook user, but I was looking over my daughter's shoulder the other day and was totally turned off by the way the Facebook layout appeared. Too many columns ... too much information in my face. I see these changes in a similar light. Sure, I will probably adapt ... but it is going to be a painful adaptation period.