Order now or wait for the new model Cayenne Diesel?

Good day Porsche municipality, I am always SUV’s dangers in the last 10 years, which have always been leased over my company, now my current leasing (Range Rover Sport) runs out at the beginning of November and after I am the Cayenne Diesel test run, I am again Porsche infected ;-). However, it is not to be leased but to be bought. I am not quite sure shortly before the order, since there is to be a new model next year and I might think about it. I would have to bridge from November until the date of the new release, which is certainly not the problem, only that I would have to wait for the new one even longer! what would you do? VG inventory xc90, x5, RRS