The Sony Xperia miro is due for release shortly so it’s no surprise that the handset has popped up on the PTCRB website. Both the ST23i (international) and ST23a (North American) variants are on the site and show that the firmware certified is version number 11.0.A.2.10. This sounds like a slightly more advanced firmware version than that certified for the Xperia tipo (11.0.A.0.30).
The Sony Xperia miro sports an 800MHz MSM7225A chipset, 3.5-inch (320 x 480) display, 5MP camera, 512MB RAM, 4GB of internal memory (2.2GB user accessible) and microSD memory card support. Other features include a battery with 1500mAh capacity capable of 5 hours of GSM talk time and 8 hours of video playback.