What I've gathered it is only the denominational side that's being modified slightly; the national side remains at the mercy of each EU member nation. Now some countries have made one-year changes (Greece, Spain, Finland, Austria) on some of the €2 coins as a type of commemoration, but nothing permanent that I know of.
A good reference (including mintage figures) can be found here.
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A good reference (including mintage figures) can be found here.