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Just like any update there isn't an specific release date for each country/network
http://www.sonymobile.com/global-en/software/phones/xperia-l/
Latest available software
You may already have the latest software, depending on the date of purchase. Software updates are released at different times depending on operator and/or country. Therefore, we cannot give you an exact date for when a specific update will be available for your device.
If you can not wait for the update then you can manually update your phone to the latest firmware
How to manually update, downgrade, root 2013 Xperias
http://talk.sonymobile.com/thread/124152
If you encounter any bugs after the latest update, it is recommended to re-install the latest update
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Please tell us any information about fix-update.
Admins, Sony Engineers.. when?
Can you give us any information, hope, confirm that the update is ready?
Or it is just excuses and we will not get any update..
Sony, my Xperia is the probably the last Sony phone in my company.
IS ANYONE IN THE WORLD TO KNOW WHEN WILL BE AVAILABLE THIS UPDATE?
Rollout of 15.3.A.1.12 has started I think.
Seems to be available for C2105 in the following regions and brandings at the moment:
Germany - Generic DE
Mena Arabic (b) - Generic MEA
Singapore - Generic SG
Can anyone with a handset belonging to these confirm?
jst now hearing that a new update15.3.A.1.12 is relesed in malaysia ,germany and it is not anroid 4.3 , its only 4.2.2 
It is only a firmware update then,maybe with bugfixes.
Mysterious Xperia L 15.3.A.1.12 firmware which was certified by PTCRB a week ago and who open source was uploaded on Sony’s site a few days back is rolling now. At present Xperia L is on android 4.2.2 15.3.A.0.26 firmware which also saw 15.3.A.0.27 firmware gettingcertified but never rolled.
15.3.A.1.12 firmware keeps Xperia L C2105 and C2104 on android 4.2.2 only and is a major update, already confirmed in Malaysia and is available over PC Companion and SUS for now, no OTA seen yet. 15.3.A.1.12 firmware is seedingnow it may not be available for all regions at the same time.
If you have updated to 15.3.A.1.12 firmware already do let us know what major changes you noticed. Is camera bug fixed for you ? give your comments below on your review for 15.3.A.1.12 firmware update.