Sony has announced that a previously promised maintenance update for the Xperia S, Xperia SL, and Xperia Acro S is hitting the internet tubes now. These devices received an Android 4.1 update a while back, but now the OEM is tying up some loose ends with a new Jelly Bean build. It should reach all users soon.
I suppose you have to give Sony credit for at least keeping its customers informed. Today, the manufacturer announced an update to its plans for bringing its phones up to Jelly Bean. If you're rocking the Xperia T, Xperia TX, or Xperia V, you should see Android 4.1 "during February and March." Of course, this will depend on what market you're in or which variant you own.
Following those flagships, the Xperia P, Xperia J and Xperia go will start to receive their upgrades starting around the end of March.
Sony loves making stuff that's hard to break. The Xperia Active was probably the pinnacle of this obsession (see: hilariously awesome video), but now that Sony has decided to make pretty much all of its phones look exactly the same, it's out with the old, in with the new.
The Go and Acro S are the newest additions to Sony's rugged family, and for rugged phones, they don't look nearly as god-awful ugly as almost everything else in that segment of the market.