Dowloaded my upgrade this afternoon. Only had a few minutes to look around, but I like the placement of the tools. Love the selective editing ability now and looks like it will take a bit of time to get familiar with the controls and editing possibilities there.
I looked right away at the crop tool to see if they now offered perspective adjustment and it appears it does not. . .disapointed. GD filter is a nice addition.
Performance-wise, I found the old version was fine, but then again I have only working with about 10,000 images in my catalog.
I will be playing alot with this over the next few days and hope to be able to get familiar quickly.