Great news, a new update has been certified for the Xperia L (C2105) but not C2104 as of now. Could be a minor bug fix or alternatively a region/network specific update. Only time will tell. I still haven't got the previous update and this new one is certified .
I reckon it is a bug fix, why?
15.3.A.1.12 2nd 4.2.2 Build, bug fix.
15.3.A.0.27 1st 4.2.2 Build (region/network specific) (T-mobile?)
15.3.A.0.26 1st 4.2.2 Build
From the .26 to .27 update there was an increment of 1, but for the newly certified build it is an increment of 2-meaning more changes made e.g. bug fixes?
This is only my opinion, nothing official.