The changes of this edition, compared to the first edition, are the following:
- The "set symbol" in the bottom right corner has been moved to the top right corner of the card illustrations.
- Solo player tile layout has been updated.
- The insert will have printing on it (and will actually be from a bit thicker material)
- Some wordings in the rulebook have been updated, the new version has been available here on BGG for quite some time now.
- The new print won't have the Grand Duchy of Finland promo card included any more.
You can tell that a box is the second edition by the "||" in the middle of the designer names, on the bottom of the box cover.
source: Re: Nations to be reprinted !!!