I made some calculations.
Dye-sub printers used to be 300 ppi. It translates to 8,6 MP without downsampling for a A4 format (8x12 inches).
If the resolution is increased to 360 ppi it would be 12,4 MP.
400 ppi ---> 15,4MP
600 pp1 ---> 34,6 MP.
I think to remember there were dye-sub printers with 300 ppi horizontal resolution and 600 ppi vertical... and this is 17,3 MP.
I expect some information from Canon. None asked Canon about this printer during the past Photokina, which is a shame.