The update features improvements to low memory stability. Some fixes are also included, such as faster GPS fix and charging LED bug fix. Currently, those on the the Experimental track are getting the update, but stable track should also get it soon.
Previously using Xperia SP and it have hardware button for home, back and recent keys but when they remove it from their latest phone I switched to other brand that still offer hardware key button instead of virtual keys
I loved Sony Ericsson before. Their CyberShot phones were superb. But now Sony you make the same looking phones for a decade now. Sony for me is just bland. Sad story.