The Indonesian Postel site is one of the sources that constantly delivers details about future Sony Xperia devices. Such details have popped up from within its system today which hints to a potential 2nd generation Xperia S smartphone, a refresh to the original dubbed Xperia SL.
Sony Mobile apparently assigned the build model number LT26ii to the Xperia SL which is the leading key factor to belive that Sony has plans to refresh the Xperia S LT26i. They did it in the past with Xperia arc smartphone, the Japan-based company launched an upgraded model called Xperia arc S.
At this point there are no further details about Xperia SL, but we are venturing to guess that it will sport a quad-core processor, maybe a larger touch screen and Android 4.1 (Jelly Bean) OS.
via Xperia Blog