lawl I saw the tweet : "New UI.X Today, 17th" and I thought it was today :P http://puu.sh/gElN5/b2bc2d7f0f.png Then I realized it has been written one mounth ago :/
How does one download latest UI.X without using the add-on? Clicking download in the customer area downloads the add-on, which as you know doesn't work with FastCGI yet.