We should probably keep in mind that what we're seeing in these videos is something like 250x as fast as we'd see it in game. (Need a developer to point out how long a day cycle is in earth time for an accurate account.)

The volumetric clouds are fantastic, and I believe they are definitely a step ahead. It's too bad the camera is fixed in one spot. The volume of the clouds might be more obvious otherwise. That said, there isn't much variation as Treesong pointed out. I'm wondering if that'll change with real weather systems.