As the demand for corn has increased because of increased ethanol consumption, the Washington Post reported this week, the number of acres used to grow wheat in the U.S. has contracted, contributing to a shortage of wheat on the world market and an overall increase in world grain prices.
According to the USDA they planted about the same amount of Wheat acres last year as before.
http://www.cbot.com/cbot/pub/static/files/snd_cbt.pdf