From the Kickstarter campaign for this edition:
The "Very First Edition" of the Green Box of Games was produced in only 100 copies in the fall of 2016. Although fully complete and playable, it featured no game rules, and might be considered an extended prototype. That is why the next version of the Box, which will be produced with your help through this campaign, is called the "Second to None Edition".
This edition also updates the tile and card designs. For example, the updated tiles have features to make these square tiles easier to use in a hexagonal layout, and the updated cards add pips and colorblind-friendliness improvements.
The cards in this edition are 68mm × 44mm.