I agree that it does seem like a typo. Probably of the intentional kind !
Not so much because of the picture, since it´s not so uncomon to see older model pictures used when the new ones are not yet available, but the fact that they state that the product usually ships in 2-3 week, seems to indicate that it is somethig that has been available already.
On the other hand, the mention to the 1Ds Mark IV appears througout the page, and these "typos" seem to keep creeping up more frequently these days so I definitely think that something's up...