For the Xperia T2 Ultra (D5303) we see a very small bump in build number from version 19.1.A.0.473 to 19.1.A.0.474. For the Xperia Z1s (C6916) the build number has moved from 14.4.B.0.20 to 14.4.B.0.37. Sony is likely refining the KitKat updates before release, so we ‘ll keep you posted if/when these updates start to roll.
Xperia Z1s firmware build 14.4.B.0.37 certified
Xperia T2 Ultra firmware build 19.1.A.0.474 certified