Sony had promised (http://www.gsmarena.com/sony_gives_an_update_on_the_jelly_bean_update_schedule-news-5227.php) earlier that they will be releasing the Jelly Bean update for all the Xperia devices that were released in 2012. Now, in a tweet from the official account, Sony has confirmed that the update is in very final stages and that more information will be provided next week.
Just a quick update to say we hear you re: JB 4.1 for Xperia P & Go, (S, SL, acro S and ion). Work's in v. final stage - more news next week