I would like to see USB-C ports, matte, non slippery backs made of composite instead of glass and natural matte aluminium frames without the silly coloring that we have in the 14 and 14 Pro models. I also would not mind if the body of the 15s were a bit thicker and the battery life a bit longer.

No need for improvements in hardware, cameras or processing power but it would be great if the software would start to improve: iOS is miserable in comparison with the hardware it runs on.