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Canon USA now offers an imagePROGRAF Print Utility app for iPad® users.
This app provides iPad® users with the ability to directly print PDF files to a compatible imagePROGRAF large format printer. Users can open their PDF files and print the file from within the user-friendly imagePROGRAF Print Utility App for iPad®. Simply select the imagePROGRAF printer from the list of available printers, choose your preferred settings, and print!
The app support most iPF 5-Color models. Compatiable printers include: iPF850, iPF840, iPF830, iPF825, iPF815, iPF785, iPF780, iPF765, iPF760, iPF750, iPF685, iPF680, iPF655, iPF650.
Here's the link from the Canon USA website describing this utility: