The technology seems to be similar to the recently announced Cayenne Hybrid. Both have 34 kW electric hybrid modules, and 69 kg NiMH battery packs in the spare wheel well. They clarified the limits up to which electric driving is possible. 50 km/h and "sailing" without combustion engine up to 120 km/h. I believe Bosch is the supplier for both the Porsche and Audi hybrid.