Canon has not provided an abundance of information on the new flash, but the images now available on the Canon Macro Ring Lite MR-14EX II Flash Review
page will enlighten you at least somewhat. The new LCD control panel is an obvious major improvement.
You will also find a link to CPN's MR-14EX II page at the bottom of the review page. This page has perhaps the most MR-14EX II information found anywhere.
I have and occasionally use the Canon Macro Ring Lite MR-14EX Flash
. I did not get a full review of this flash completed, but will try to get the version "II" review done more expediently. B&H
is taking preorders for the MR-14EX II