I'm sad to hear that this issue has raised its ugly head again; I sympathise with your situation shhooter.
You'll notice from my earlier posts that Canon (like JustMeOregon) accused him of over cleaning. I would suggest sticking to your guns over this; whilst it is impossible to tell the condition of your lens from the photo you posted, unless it is a total knacker, I think that the onus is on Canon to prove misuse. Whilst I wouldn't want to be the one to have to issue a court summons against a global corporation, I think the law (in Britain, at least) would be sympathetic. In the UK, under the Sale of Goods Act 1979, "goods must be as described, of satisfactory quality and fit for purpose". Canon's UK website states:
"The EF 24-70mm f/2.8L II USM is robust enough for daily professional use. Weather sealing protects against dust and moisture, while a fluorine-coated front and rear elements are easy to clean."
I would argue that the front coating peeling off a lens that is otherwise in good condition and under two years old (release date: February 2012), doesn't fit within that description.