Here is the list of changes (additional information is available here):
Add the following enhanced features:
[Grain Effect]
[Grain Effect] has been added to [Monotone], [Soft Monotone], [Hard Monotone] and [Hi-Contrast B&W] mode as adjustment items under [Image control] of the 6 [Image Process Setting] menu in the [Still Image Setting].
[Horizon Correction]
[Horizon Correction] has been added to the 7 [Shooting Assist] menu in the [Still Image Setting].
Improved Contents:
From the power off state, the start-up time when starting by pressing and holding the Playback button has been shortened.
Improved the response of the release when shooting subjects with different brightness continuously.
In [Auto-area AF], improved the phenomenon that the focus on behind in rare cases.