Opel (GM) will show a hybrid concept car dubbed Flextreme.
The Opel Flextreme is really very flexible as the name tries to communicate. The car would allow you to store a Segway and charge it - nice touch!
With the lithium batteries the Flextreme has a range of 40 miles. A 1.3l diesel engine is recharging the batteries. They can also be charged by a power outlet (PHEV - plug-in hybrid electric vehicle). The Opel Flextreme shows some relationship to GM's Volt.
The 62nd International Motor Show (IAA) Cars takes place in Frankfurt, Germany from 13 to 23 September 2007. See also the IAA site.