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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
695.8 mb
Sorry guys but just heard news and now its confirmed that Android version is still Android 4.2.2 . Sadly!!!! :((
Dear sony, I just updated my Xperia L for the last software available, 13.3.A.1.12 and i must say that video flickering continues in this version...
i don't want you to have much work figuring out what is the cause of that so i just want you to put your phone in camera mode, go to video, now put half of the screen in low light and half in stong light and "voi la" there you have the flickering... and you want to know more? the problem is in how the camera mesures the light that is coming to sensor... now that you know the source can you please fix that?
I have made a video, here it is, blink blink, blink
http://www.youtube.com/watch?v=2nqy-XzcW2g
by the way, no more bugs found, yet 
- camera is better
- flash now sinc with obturator
- transfer files to sd now fixed
- flickering screen seems fixed
jst now updated my sony XL with 15.3.a.1.12 , i am very much satisfied with the new update and al most all bugs are fixed and camera improved a bit ,working well now till now there are no issues
1.Camera Flash timing fixed
2. Screen Tearing Fixed
3. Walkman Widget on lock screen fixed
4.sd card tranfer also solved 

15.3.A.1.12 FIRMWARE IS OUT ALMOST ALL BUGS ARE FIXED
1. Camera Flash timing fixed
2. Screen Tearing Fixed
3. Walkman Widget on lock screen fixed
4.SD CARD TRANSFER ALSO FIXED
And yeah don't wait for a OTA update i.e. A Update notification for firmware upgrade on your phone because it will take atleast a week or two for an OTA update.
PC Companion or SUS is a better option if you want a successful and available update.
it is available in India. hope all bugs are fixed
I am using XL with 15.0.A.2.17...can i update it 15.3.A.1.12 straight without updating to 15.3.A.0.26 ?