These are a little small, but you get the idea....
Something might be internally influencing the hexagon shape, but what? Maybe another probe someday, equipped with radar to penetrate the clouds might answer some questions….
Snowflake crystals typically have hexagonal geometries, but how a geometry that miniscule in size could be propagated to a feature larger than the diameter of the earth is hard to imagine.
These are a little small, but you get the idea....