That, according to these latest spy shots, would be the Golf R Variant. For those unfamiliar, Variant is what Volkswagen calls the wagon version of the Golf (in some markets, anyway). It offers the Golf Variant with a variety of engines, but as the spy shots reveal, it is now working on bringing the Golf Variant and the Golf R together into one high-powered, long-roofed model.
The VW Golf R Variant would in all likelihood pack the same 2.0-liter turbo four as the hatchback, splitting 290 horsepower between all four wheels. Only in the wagon, it would offer that extra bit of utility. Of course there's no guarantee that Volkswagen would offer the Golf R Variant in the North American market, but considering that the Golf R hatchback will soon be joined in American showrooms by the Golf SportWagen (as it's tipped to be called here) in place for the Jetta wagon, the possibility is definitely there.