The Android 4.1 is expected to be offered to the Sony Xperia devices- Xperia T,V and VX this February and March. What is included is updated versions of Sony Walkman, movies and albums, option to personalize UI, updated Google Now and better camera usability.
The users of the Xperias mentioned above can click here for checking the updates. The expected dates for the update may vary from country to country. Get details about the all new Sony Xperia Z here.