Unless you actually owned an Xperia T2 Ultra or its Dual variant, Sony's latest Android 4.4 update for the devices might not have piqued your interest. However, it seems that the manufacturer sneaked in a little feature, or rather returned it, that changes the game entirely for these owners. Sony has apparently given them back the ability to transfer some apps from internal memory to an SD card.
This feature, called Apps to SD (or apps2sd), was a rather contentious issue way back. Google has practically removed all traces of it from stock Android and users might have become resigned to that fact, unless they switch to custom ROMs or their OEM allows it. Google's argument is the same one it uses to discourage the use of external storage entirely, that of data and operation integrity. Considering that users can easily yank out SD cards and that it runs on a different filesystem than the rest of Android, Google can do little to enforce security or make sure that the app is where it is supposed to be when you run it.
The counter argument to this is that some devices don't have enough internal storage space to comfortably accommodate the dozens of apps users usually install on their phones these days, plus the actual media files they might want to keep in their pockets at all times. Some games, for example, take up more than 1 GB of storage. As mentioned, some OEMs, and definitely custom ROMs, go contrary to Google's ideal vision and include Apps to SD functionality. Sony used to but then pulled it out, perhaps to maintain compatibility with vanilla Android. Now, however, Sony is bringing it back, at least in this update, which is great news for the Xperia T2 Ultra as it only has 8 GB of internal memory.
Now the next question is "what's next?". Considering Sony was rather silent about this feature in its announcement, perhaps it won't be including that feature in other, more capable handsets. Scheduled for the next update are the Xperia E1 and Xperia M2, both with low specs and perfect candidates for this feature. One can only hope that Sony will also be pushing out the feature to the rest of its lineup in the near future.