IMHO. the prototype is nearly perfect. As some people said, a ministick if it's not added to the prototype.
There will be any other throttle? I mean, A twin Engine Throttle, more expensive and a less expensive single engine throttle? later maybe a WW2 throttle? and a WW2 grip?
For a single engine throttle, a similar philosophy used in CH Pro Thottle with a new grip & base design, using same buttons design in front right and similar buttons behind the grip like the prototype is a must-have for me.