From a recently leaked screenshot, we can say that SONY is working on a new firmware for SONY Xperia S and Xperia SL. They are mid ranged Sony smartphones launched last year and got many updates at that time but this time the build number is 6.20B.1.96 and named JELLY BEAN, this is latest firmware SONY is going to launch.
There is no official details about this firmware however the update will fix the 1080p video recording and volume up/down bug with many minor improvements like performance and stability. The new dates are expected to roll out at the end of this month.
The previous firmware that brought the SONY Xperia S and SL to the Jelly Bean that was to good news for Sony and for the users of this phone as well but there was too many bugs like applications crash and many others like that, but now this is looking that Sony is going to fix all these.