The Sony Xperia M dual can now enjoy Android 4.3 after the company has released the update via its Sony PC Companion.
The 15.5.A.0.18 firmware update is currently being seeded in Brazil and parts of Europe. It clocks a bit over 770MB and brings an additional White Xperia user interface as well as additional access to downloadable Xperia themes.
Sony has also bundled its Smart Social camera app with the update, as well as the updated Walkman, Movies and Album apps. Finally, along with the bug fixes and performance improvement, security has also been tightened up, according to the firmware's changelog.
If you're impatient and want to do the flashing yourself, follow the source link below for more details.