This is quite a delay for Toyota. In fact, Wohlgamuth told us that Toyota had originally wanted to make the plug-in technology available in the third-generation Prius, which is launching in this spring. She wouldn't clarify what caused the hold-up or give any other details. There is one way that the Prius timeline is moving quickly, though: she said that pricing for the 2010 Prius will likely be announced this week.
A PHEV Prius wasn't available at Cobo Hall, but we've got plenty of pictures in our archive. The shots below are from late 2007.
UPDATE: We heard back from Toyota's Jaycie Chitwood and got a bit of clarification on the PHEV capability of the new Prius:
During its development, the new Prius was designed and engineered to package either the lithium-ion battery pack with plug-in capability, or the nickel-metal hydride battery for the conventional gas-electric system.