Peter, take into account that the new PlusFour is light weight but significantly heavier than a Trad Plus4. Therefore I think that 250 Hp ist adequate. And concerning the manual gearbox it will also help that the reduced torque lets control the car even better.
Back to the theme of the thread, as I said the whole package must be right re a new 4/4. If they do it as well as the PlusFour we can look forward to see a nice nimble slim and lightweight new car.