I'm sure he meant for Devs but yeah a lot are obvious but we have to wait and see for:

Will Job-specific gears be meldable?

If it follows the XI route of JSE/AF it probably won't be but it will probably be upgradable (unless they completely forgot about Empyrean Armor they just created..)

Will cross-class abilities be less punished?

Given that we need class definition I doubt it will be absolutely free like it was before since that's why there wasn't any definition or so to say 'image' to classes.

These alone depend on what is done in 1.20 and 1.21 so it's a wait and see situation.