Sounds sensible, could well be. Mine was a personal lease.
My first lease was a business lease as a sole trader and I was not allowed to buy the car my last lease was personal and I was given a purchase option, both direct with VW so maybe that is the difference?
It isnt a GT86 replacement, its is the Toyota Supra replacement. The Toyota variant will be a coupe, not a folding tin top. The Z4 will have a cloth roof for weight reasons, the last Z4 was criticised for its weight and lack of agility - the new Z4 is being pitched against the Boxster so it needs to up its game on those fronts.
It's about weight.