First builds rolling out
rest follows hopefully
These are beta builds, they contain the latest state of PA + an early version of PIE, which still needs alot of work.
the basic pie control is official AOSP Google sourcecode, see it here: https://github.com/android/platform_packages_apps_browser/tree/jb-mr1-release/src/com/android/browser/view
Now since the first port a lot of work has been thrown in, basically we have rewritten the entire math, pretty much all the classes, made it behave like we see fit, extended the heck out of it and integrated it into SystemUI as a fullblown 4th UI. The actual commits will be visible on Github soon.