Too bad the pictures doesn't show as much as in the flesh...
On the left the 'old' and on the right the 'new' one.
Differences are minor but noticable. In direct sunlight the darker background is neglectable; in a dim lit room it's more pronounced.
The new one has some kind of 'Kodak Lustre' finish to it; sort of classroom photo treatment. Tapping has the same feeling but swiping or pinch and zoom is (far) less comfortable. As a plus it's even more resistant to reflections.
The lowest LED 'slider setting on the 'old' one set the LED completely off.
The lowest LED 'slider setting on the 'new' one set the LED very low but a tad brighter than the second low setting on the 'old' one.
Picture 1: natural light - LED Off
Picture 2: LED Max
Picture 3: LED Max