The Xperia T and TX, the latter of which I quite recently reviewed, are slated to receive an over-the-air update globally in the next week* (*unless you're on AT&T, in which case the ETA is: haha, good luck), and it's packed with features. Features that do things. Here's the breakdown.
First, Wi-Fi Miracast display mirroring, which is actually a stock feature in Android 4.2. And in case you're wondering - no, this is not an update to Android 4.2, you're still stuck in Ice Cream Sandwich-land.
Next comes an "extended standby mode," which is basically similar to the manner in which HTC Sense 4 phones go into a "deep sleep" overnight, only receiving SMS/MMS messages and phone calls, while turning off mobile data and Wi-Fi connectivity.