I have never seen another VW with those wheels. Only one with similar wheels...
Audi R8 V10
I read somewhere those might be Golf R 19" wheels which had been tested and fitted to the GTI concept for show purposes. They do look more like GTI wheels with the black areas so those might be for the Autobahn version, Golf R wheels might look more like Audi S wheels.
GTI MKVI | My flickr Photostream
All mkvii GTi wheels are very nice.
I really like those 19'' inches agressive wheels on this amazing white GTI !!
I hope they will be available in 18'' also.
I also like the one with center caps on the future golf and the new angular 5 spokes.
I like 18 and 17'' better then 19'' for cornering, comfort and rubber price