I would give the proportion maybe a yes but the detail - that is so.....2006.
The 5er will be out in 2010 the beginning of the next decade even.
So the detail will reflect this just as the detail of the E60 reflected this decade . Some details will remain such as the agressive looking front end the front lights will be more slimmer but still have that angular look inbetween them the kidney grille will become a little wider and less curved than todays car.
The rear end carries over with split lamps a shape similar to todays car wraps around the rear wings and connects the swage line which is more of a ledge than a flat surface than todays car . The licence plate is relocated to the rear bumper while a prominent BMW logo takes place in the centre of the bootlid.
Just as today's 5er is technologically advanced the next one will inherit some options that you will see first in the next 7er such as BMW's Connected Drive and Autopark functions.