I don't know about Shell, but according to
this article cellulostic ethanol is FINALLY going to start being used in mass production. Poet LLC (the current largest refiner of ethanol in the US) is putting up a plant that is due to start production in early 2013, and BP has a plant going up that'll be running in late 2013. This is what has really been needed to make cellulose a viable and reasonable alternative fuel IMO. The price should drop, the energy to make it is less as well as the alleged impact on the food supply.