Porsche Cayenne coming in 2008

According to Reuters, Porsche is moving forward with plans to convert the Cayenne to a Cayenne hybrid vehicle by the end of 2008. By mid-September, Porsche hopes to finalize a partnership with either Toyota, DaimlerChrysler, or Volkswagon. Early indications hint at a Volkswagon partnership, which would probably make the Porsche Cayenne a diesel-electric hybrid, rather than a gasoline electric hybrid. Such a move; however, seems somewhat risky. I mean, where are the Volkswagon hybrids?