Android 4.3 for our xperia s. So far everything actually works good for an alpha. The most important things are working, everything is fast and smooth, it's actually a good daily driver. You can see everything here http://forum.xda-developers.com/showthread.php?t=2391058
Note: This is an alpha, neither me or the devs that created it are responsible for anything that could happen to your phone, so back up your data and read the instructions carefully.
Note2: One significant bug discovered, Google play gives you an error when you want to update some apps.
We have not been forgotten, my friends :)