It is pure speculations. Anyone can make semi-educated guess of what Apple would do with the next iPhone. Antenna redesign? If Apple wanted to make a hybrid GS

It is pure speculations. Anyone can make semi-educated guess of what Apple would do with the next iPhone. Antenna redesign? If Apple wanted to make a hybrid GSM+CDMA iPhone, then the antenna has to be redesigned. Aluminum backing? Instead of the glass back-plate in iPhone 4, Apple could replace it with Aluminum one. There's a replacement Aluminum back-plate for iPhone 4, sold by third party.