Ugh annoying headline. "Buttonless" implies the buttons are disappearing, like the home button. The articles says they might be using "solid state buttons" which, I think, are a bit like the Macbook trackpads, there's no real button but it still acts and responds just like a trackpad button.
The lock and volume buttons likely will still be there, just won't physically move, and use haptic feedback instead.
Napkins seem like a pretty normal thing to expect at any eating establishment.