I can see the Levante doing quite well, especially if the press quoted figure of £55k is broadly accurate. That's the price of a 3 year old Range Rover or Range Rover Sport, with 40k miles or so on their clocks and a finished warranty.
I'm a big Range Rover fan, but I have to say that the good reviews for the new Maser are encouraging and would make me think before automatically just renewing my Rangie for another.
A petrol version would be nice though. My RR Supercharged (petrol) gives me about 17mpg on average, so it's not as if the Maser would be worse!