It is impossible for a watch or any other device that is not a body thermometer to tell you what your temperature is. Maxim can tell you what temperature the skin has on the surface. However, Apple seems to have found the perfect algorithm to tell you your body temperature.
Ming Chi Kuo says Apple has found the perfect algorithm that can determine body temperature, something unique in the industry. This function will not give a specific value, but will tell if the temperature is normal, high or too low. You may also want to see a doctor or use a dedicated thermometer.
We will not see other interesting specifications on the 8 Series. It may even have the same processor on the 7 Series. Instead, a rugged model is expected.