http://www.detnews.com/apps/pbcs.dll/article?AID=/20080916/AUTO01/809160402/1148/rss25
Apparently it should go as much as 60+ KM on just electricity. November, 2010 is the ETA.
They have some pretty lofty ambitions/expectations for it..... this little snippet comes from the linked aticle:
... Lutz said the hybrid vehicle will help reestablish GM as a leader in technology and fuel efficiency, a title the automaker has lost over the years. "With one fell swoop, the Volt will erase that" misconception," Lutz said"