Wörthersee?
There are all the articles in the link I provided. I'm not sure which one is best.
Long story short, it was a one-off concept built for an annual meet at Wörthersee, Top Gear's verdict was 'not sorted'. It has a very short wheelbase for 200mph.
The idea was to preserve the hatchback roofline and get massive downforce without a tacked-on wing. One way to look at it is as three internal ducts feeding the wake. Another is as two flying buttresses tied to a towel-rack wing.
There's a custom bubbletop over the W-12.