Here are two articles on news covering Porsche Cayenne in the next years, from Top Speed. One features info on TechArt's individualization programs for the 2008 Cayenne, and the other covers some info on Porsche's intentions with the Cayenne for 2010.

"In a very short time, TechArt will unveil a new individualization programs for the 2008 Cayenne. Besides the new TECHART Magnum and the new Aerokit I, TECHART will offer a manifold choice of technical options. The Magnum will be presented to the public at the upcoming Frankfurt IAA among other TECHART world premiers. The delivery of the first TECHART Magnum vehicles will start in August. The Aerokit I will be launched in September..."



"What is wrong with Porsche and Volkswagen? They keep on creating SUVs that compete against each other for sales. And they will continue doing this with next generation Cayenne and Touareg, both coming in 2010..."



You can read the first article here:
2008 Porsche Cayenne by TechArt - Top Speed

And the second:
New Cayenne coming in 2010 - Top Speed

 

Regarding Porsche and Volkswagen, the Cayenne and Touareg are automotive cousins and developed jointly by the two automakers. I'm sure their intention was to save costs. It takes a boat-load of cash to produce a new vehicle. This way they split it. The VW isn't supposed to compete with the Cayenne by virtue of price point. But then again, VW seems to think they can ask Porsche-like prices. Big mistake.