It never is ... Unless one reallyy reallyy likes the old shape, it is never a good idea to buy old shape when the new one is out/about to come out. Even a discount of a 100-200k that one gets when buying a brand new old shape model falls short in the long run as it will become outdated rapidly as more and more new shapes come on the road.
Long story short ... If you want the old shape, get older ones which have already depreciated significantly so you get the least possible hit.