They also announced the Xperia V which is similar to the 'T' but is dust and waterproof:
4.3” HD Reality Display powered by the Mobile BRAVIA Engine 2 for razor sharp clarity
13 MP fast capture camera with full HD video recording.
Latest generation 1.5GHz dual core processor for improved battery life, fast performance and ultra sharp graphics
Easy connectivity with One-touch ‘One-touch’ enabled by NFC
Clear audio+ for the highest level of sound quality
Android version 4.0.4 (Ice Cream Sandwich). Will be upgraded to Android version 4.1 (Jelly Bean) following launch.
Highest levels of dust and water resistance in a smartphone (IP55/57+) ensure protection from the effects of immersion up to 1m for 30 minutes
MHL connectivity for viewing content on a big screen without the need for a charger