A bigger grip
Olympus usually has pretty shallow grips on its entry- and mid-level cameras and offers an accessory to improve the comfort. This time around with the new OM-D E-M10 Mark III, it just increased the size. The text on the controls is also a bit bigger, something I appreciate now that I'm older.
Front
You can see the curve of the new grip here.
Shortcut
The button by the power switch provides a quick way to move up a menu level when you're in the settings.
Advanced Photo mode
All the beyond-basic modes have been consolidated into the new Advanced Photo mode and laid out with a more approachable interface.
Labels
The navigation buttons now have labels with the default functions on them.
Bleach Bypass I
The camera gets a Bleach Bypass Art filter with two variations.
Bleach Bypass II
'Splain me
Olympus has added more explanatory text as well.
Advanced Photo mode
More visual
Olympus has followed the crowd in delivering a more photo-heavy interface with examples of different shot types.