No need to quote "Someone at Tesla":
http://www.torquenews.com/2250/musk-raises-expectations-tesla-bold-new-statements
Thanks for noticing I made an error in the comment. Ten years was indeed from Musk and came last year. Five years is what Andrea James indicated someone at Tesla told her. She wrote this a couple of months ago. Someone at Tesla told James they now expect the cost per kWh to fall below $100 in the next 5 years (she might have written "by 2020", I don't remember precisely). Fwiw I think it is very likely it came from Musk.
Update: Adding link to streetinsider coverage of James' early March report.
http://www.streetinsider.com/Analyst+Comments/Tesla+%28TSLA%29+Buy+Rating+Maintained+at+Dougherty+Following+Factory+Tour/10348143.html
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