A new firmware update for the Sony Xperia TX (LT29i) with build number 9.2.A.1.199 appears to be rolling according to a user on XDA. Strangely the user got a OTA notification, but checking the customisation number, no new update seems to be available. The OTA download is only 8.3MB, so either it was mistakenly pushed out by Sony or it only has minor changes.
Anyway, this new firmware build (9.2.A.1.199) was recently certified for the Xperia T and Xperia V, though the Xperia TX page has not been updated. We expect this new update to bring a number of bug-fixes from the previous Android 4.3 firmware (9.2.A.0.295), from which a number of users are having problems. We’ll keep you posted on the rollout for other handsets.