A new firmware build with version number 9.1.A.1.145 has been certified for the Sony Xperia T (LT30a, LT30p) and the Xperia V (LT25i). The last released firmware was version 9.1.A.1.141, although this only appeared on the Xperia T (the latest Xperia V firmware is 9.1.A.1.140). Either way this looks like a minor Android 4.1.2 release.
The Sony Xperia TX (LT29i) also has a new firmware certified with version number 9.1.G.0.3. The form of this firmware differs from previous releases (9.1.A.X.XXX and 9.1.B.X.XXX) so it could be a specific carrier update, it is not likely to be Android 4.2.2 before anyone gets too excited. We’ll let you know if any of these versions start to roll out.
Thanks Jan & Silas!