I think a heat pump makes sense, they have done it for the Model Y, they want to try and standardise between the two models as much as possible, and adding a heat pump will improve its range in the cold. No brainer. The lights and powered boot seem a bit less unlikely, not sure why the lights would change, the powered boot would surely add additional cost, I assume the Y boot is heavier because its a hatchback to, and they probably wouldn't be able to share the same parts for that because of the difference there