20 buttons! Also comes in white for your mac kids.
Can find out more info and pre-order them on the logitech store here.
What is harder to see from the photo is that the thumb buttons are individually shaped into 2 kind of grousp, so your thumb sits in the middle and they will be easier to recognize.
I've personally had problems with razer's build quality in the past, so I'm hoping this will turn out to be a decent alternative to the naga.