And the grip. It might have the same dimensions, weight and bounce, but for sure the handling and the aerodynamics are going to be different.

I was wondering the same...does it shoot the same or will it curve like a wiffle ball?

Regardless it'd be great to not have to pump... especially on cold days.

The openings don't seem like an important part of the airless design. Once the structure is there, you can close them up for aerodynamics.

Plus less (no?) Magnus effect.