A rumor about the iPhone 16 is that people say it will have a bigger display meaning that it will most likely be bigger than the 15 and all the others that have been created, another is the battery changes saying that it will last longer and won't die off so quickly since the others tend to do that and you would have to charge it from time to time constantly. there could also be stronger wifi support the one currently isn't much help and many hope for the 16 to have better support towards it. the microphone is also rumored to be better than some of the iPhones you would have to get close to the phone for the other person to hear you on call or Facetime most of the time you would even have to be loud enough so they can hear you. one main one many hope for is the thermal design to be better iPhone tend to get hot quickly when on call or just being on it for a while and this could be alot of help so it could cool down quicker or not get heated quickly.