They added a "Casual" difficulty, combat is easier and you'll level up faster, Arabic has been added to the text languages, miscellaneous bug fixes have been made and new settings have been added to the Graphics category under Options: Ray Tracing. Toggle Ray Tracing on or off.
Oh and look at there, zombies have their hats and glasses again, just like how it was shown in the launch trailer.
You'd think that'd be the first thing they'd fix.