A few things I've noticed still need work (obviously no one has any right to expect perfection, not even a beta has been released)
First, in the screenshots and video, I noticed that the images on the left of the main menu seem stretched horizontally, or vertically compressed. When you resize these, the best thing to do is scaling, not click and drag. (if you prefer click and drag, at least hold down the shift key to lock the aspect ratio of the image while resizing)
a comparison:
Apple TV
XTV
Second,
The scroll bar is entirely unneeded, it is useful when you have a mouse, but it does not fit this skin. Watch the Apple TV, you will never see a scroll bar, it's "extra" and this is a minimalist interface.
Finally, the "highlight" around the selected text could still use some work, it looks like it's still the original image from the first alpha. I think that was just a colorized version of the one used in PM3.
Please don't take this the wrong way, it's all meant to be constructive, and I know with all the hard work you've put in, it could easily be taken differently. Keep up the great work, I'm sure a lot of people are very excited to see this release.