I'm good with no design change. I just want all the improvements to sound quality and battery life/longevity they can fit in the same form factor.
Absolutely this. There doesn’t need to be a design change with the AirPods, Apple likely doesn’t have any inclination to change the design, given that they do serve the purpose the way they currently are now, and of course, they are unique to Apple for the iconic design that’s been used for the wire EarPods for years.
But I would gladly accept improvements to the sound and the battery life, add water resistance as another feature, and maybe improve Siri capabilities and extend its functions as well.