You can download it here: sony.com/electronics/support/e-mount-body-ilce-1-series/ilce-1/downloads

Benefits and Improvements

• Fixes an issue where the camera may not start when the Mode dial is set to Movie and the NTSC/PAL selector is set to PAL
• Improves the operational stability of the camera

So this is a bug fix release and no new features have been added :(