A new firmware update has been certified for the Xperia T2 Ultra (D5303, D5306) with build number 19.1.1.A.0.165. This compares to the current Android 4.4.2 KitKat build 19.1.A.0.473 for the handset. There is a chance that this latest build could bring Android 4.4.4 to the Xperia T2 Ultra, but there’s no firm evidence of this so far.
Additionally, the D5316 variant of the Xperia T2 Ultra has seen firmware build number 19.0.1.A.0.244 certified by the PTCRB.
Xperia T2 Ultra firmware build 19.1.1.A.0.165 certified for D5303 and D5306 variants
Xperia T2 Ultra firmware build 19.0.1.A.0.244 certified for D5316 variant