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The U.S. is following Canada's footsteps regarding the production of pennies and nickels. According to U.S. Treasury Secretary Tim Giethner, our U.S. Mint intends to remove the penny and nickel coins from circulation beginning early in January 2013.
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http://www.wealthwire.com/news/inflation/4210?r=1
I'm aware of calls for changing the metal composition for the coins, but this is the first I've heard that they will be phased out altogether. The quoted article does not list a source for their claims - I'm not able to corroborate it anywhere... Probably just a bad interpretation of remarks Geithner made last March.