Sony has revealed plans on updating its ICS running handsets, the Xperia P, Go and E to Android 4.1.2 Jelly Bean this week. You should see a notification regarding the update anytime now, or check the PC companion application.
The company also confirmed that that the Xperia S, SL, Acro S and Ion will start receiving their Android Jelly Bean update from the end of May. So its atleast a month before Sony's once top of the line models get updated to Android 4.1.2 Jelly Bean.