[pksadiq]

This specific change shall excite many as CC BY-SA 4.0 is one way GPLv3 compatible, but CC BY-SA 3.0 is not. Which means that free software developers can now embedded many Wikimedia contents in their GPLv3 applications. This seems not mentioned in the blog post though.

[seabass-labrax]

Incompatibilities between content and code licences has been a perennial problem for FOSS video games. CC-BY-SA-4.0 is an important step in the right direction!