It looks like we have some information on the Sony Xperia SP Android 4.3 update, the details have been revealed by French mobile carrier Free Mobile, who have the SP listed on their site with a date of December of the Android 4.3 update.
The Sony Xperia SP comes with Android 4.1.2 Jelly Bean, and it looks like this device will skip Android 4.2.2 and jump straight to Android 4.3 Jelly Bean.
As a reminder the Sony Xperia SP feature a 4.6 inch HD display with a resolution of 1280 x 720 pixels, the handset is powered by a dual core 1.7GHz Qualcomm Snapdragon processor and it also comes with 1GB of RAM.
Other specifications on the Sony Xperia SP include 8GB of built in storage, plus a microSD card slot that takes up to 32GB cards, it also features front and rear facing cameras.
The front facing camera on the Sony Xperia SP is a VGA camera for video calls, on the back we have an 8 megapixel camera with an LED flash and auto focus.
Of course this has yet to be confirmed by Sony, it is possible that Sony could release the Android 4.3 update for the Sony Xperia SP earlier than December, and the December release date is just for this particular carrier.
Source Xperia Blog