A number of Sony Xperia handsets with Japanese carrier NTT DoCoMo will soon be updated to Android 4.1.2 Jelly Bean firmware. A new firmware build with version number 9.1.C.0.464 has been certified by the PTCRB website for three key models including the Xperia AX (SO-01E), Xperia GX (SO-04D) and Xperia SX (SO-05D).
The 9.1.X.X.XXX build has signified Jelly Bean firmware for western handsets, so we have no reason to believe the same won’t apply here. Hopefully, Japanese users won’t have too long to wait.
Update: We missed this, but the Xperia AX Jelly Bean update started to roll out on DoCoMo earlier in the week.