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. Following that release, the Xperia S, Xperia SL, Xperia ion and the Xperia acro S will be updated "in the subsequent weeks." Of course, schedules are always subject to change, but all of this information lines up pretty well with what we've heard before from the company. The leading handsets will allegedly get updated in Q1 2013 as was promised and the other handsets never had any concrete release dates, so this is better than nothing.
On the list of phones that won't be getting updated, we have the Xperia miro, Xperia tipo, and Xperia sola. This is disappointing, since all three of these phones were released within 2012 (the miro only came out in September) ,but Sony's decided that they will stay on Ice Cream Sandwich. At least you guys know, right?
Silver linings, I suppose.
Source: Sony Mobile Blog