Sony Ericsson through its channel developer makes available a ROM Android ICS Alpha 4, for now only be installed on Xperia Arc, Xperia and Xperia Neo V RAY. The ROM in question, however, is not suitable for everyday use of the terminals, for telephony, WiFi and Google apps are not working, if you are a developer and want to install this Alpha ICS must bear in mind that you need the number build 4.0.2.A.0.42 have on your terminal and unlock the bootloader.
In any case, the features that are already listed directly from the source:
Google Mobile Services (GMS) apps are not included (for example, Gmail, Google Maps, etc..).
New “Roboto” font.
New “Holo” theme is supported (You Are Able to test apps written to make use of the Holo theme).
Music player control from lock screen.
Updated UI in the Settings menu.
Updated UI on the web browser.
Updated UI and interaction with the new messaging action bars.
Updated UI for improved multitasking.
Swipe to dismiss notifications, tasks and browser tabs while in the Notification.
To satisfy your curiosity you can see in the video made the news with ICS, even though the interface is customized, but Sony already perceive the potential and a good preview of Android 4. We just have to wait, even by virtue of the fact that Sony recently, declared that it is difficult to develop a new version of Android, but this video gives hope in a not too far out, at least for the three devices mentioned.