This is legitamate, there is currently a great deal of lobbying going on in DC to move the standard to 15% without the completion of studies as to the impact on most engines. The original goal and efforts were targeted at 20% and the proponents are now trying to show they are reasonable with a compromize to 15%.
The ones pushing for this are the mid-western farm states, the corn producers and the ethonal people. It is being fought by the auto industry, other grain users such as the livestock and food grains companies and many others.
My own opinion is that because of Obama's focus on alternative energy sources this has a good chance to become law even if it does not make scientific or environmental sense.
You might want to keep an eye on what happens and you may want to write to your representatives.