A 2013 Accord Plug-In has been spotted out on the roads testing, albeit in fairly heavy camoflauge.

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2013 Honda Accord Plug-In Side View
Giving away the Accord's plug-in nature, is the extra fuel cap on the friver's side front quarter panel.  It is thought from these pictures that Honda will be giving the Accord unique styleing as compared to its standard petrol version.  A little uniqueness is always a plus.

As for specs, honda is mum on the details, but expect the car to officially debut later this summer.

Automotive.com