While the E-series cars will be aimed at maximizing efficiency, they will still offer a variety of powerplants including turbocharged 600 cc two cylinder engines running on either gas or diesel. Those will be joined by both hybrid and all-electric versions using lithium polymer batteries.
The original VW up! concept was a four-seater (barely!) but the production model may only be a 2+1 or perhaps 3+1 like the Toyota iQ. The 600 cc E1 should easily get CO2 emissions of under 100 g/km when it launches in 2011.