Hard to imagine a significantly better battery. That said, I'm expecting to upgrade the 12 Mini to next year's Mini (four years since I bought my prior phone so this is not my norm). Much more efficient modem that will increase battery life and speed, and likely the usual but decreasing incremental gains in processor speed and efficiency and camera. While the better modem is reason enough, hoping for a touch ID power button. Not sure that will happen as then cases will all have an uncovered side of the case for the power button (unlike the iPad which is mostly used bare). A plus would be higher frequency PWM. While so far I don't seem to be sensitive to flickering OLED screens, I can't help but think that since there are those who are extremely sensitive, PWM may have health impacts on everyone even if you don't get headaches or eye strain.