I had a similar problem with my Canon printer but after it had been working. It stopped wirelessly connecting to my MBA but did connect wirelessly to our MacBook. I turned it and my MBA off, waited, turned them back on and it did not fix the problem. Then we had some electrical work done on the house and the power was out for 15 minutes. That fixed it! So the first action I suggest you unplug it, wait a minute or more and then plug it in again.
I found it useful to install the software form the CD provided with the printer rather than downloading the drivers. The download options were confusing with different drivers for different functions and the scanner did not work from the System Preferences > Print & Scan menu until I installed the software from the CD.
If all else fails contact Canon. It could be DOA and clearly is covered under the Canon warranty.
http://www.canon.co.uk/Support/Consumer_Products/Telephone_Numbers/telephone_num bers.aspx