Japan I've omitted. The difference in script in invisible to most non-Japanese people, I'm sure, and my topic is essentially a visual one.
I've omitted countries that merely changed their metal types (Poland and UAE, I believe, as our member Pabitra pointed out to me via email) and those with fewer than three new circulation coin types, which rules out the 'peso dominicano' and also Venezuela. Pabitra has mentioned Bhutan and Panama, but I don't see how they fit - at least not with my stated criteria.