That 2012 in the article has to be a Euro spec, since the first Cayenne diesels in the US will be 2013 models. Mine's coming next month. But the base Cayenne lists 4-zone as an option. I didn't look further, but assume the other gasoline models do as well. I'm trying to figure out why it's only the diesel that gets screwed. One thing that comes to mind is that the diesel fuel tank is 4 gallons bigger than the gasoline models. So perhaps there's not enough room for the rear plumbing and wiring. But that doesn't explain 4-zone in that Euro diesel (unless it has the smaller fuel tank). Other than that, I'm open to suggestion.
I wanted 4-zone, because the dual zone in my 2011 Touareg sometimes seems to have to work too hard. But maybe I'll be lucky, and find that Porsche did something to improve the dual zone