Have you been using the printer wirelessly with any other devices yet?
If you are already using it wirelessly with other devices, you're going to want to check to make sure your printer has the correct firmware version to support Airprint. You can print a nozzle check to confirm the version.
http://kbsupport.cusa.canon.com/system/selfservice.controller?CONFIGURATION=1011&PARTITION_ID=1&secu...
