Excellent question Aikon in terms of the new chipped cartridges,
By way of history, most of the recent Canon Medium and high end printers have used the BCI 3&6 inkjet cartridges. Rather than being called cartridges, they are more accurately described as ink tanks. The more accurate cartridge designation might be reserved for the HP and Lexmark line of printers where the cartridge bundes the inktank with a cheap printhead on the cartridge itself.
This is not comparable with the Epson and Canon design where the printhead is on the printer itself. So anyone either refilling the cartridge type cartridge
with the printhead on the cartridge itself is stuck with using a previously used OEM cartridge. Not so with the inktank type of cartridge and many third party cartridge makers make new inktanks compatable with Canon's for very cheap.
The recent Canon lineup for middle and high end models add a chip to shut off those third party makers. For those wishing to refill inktanks printers using the BCI-5 and CLI-8 cartridges, that is still possible. Except the chip counts how many times the nozzles fire, and when the cartridge should be empty even though you refilled it, it pops up a message that the printer is shutting down. The user can still continue printing with a cartridge they refilled but it basically voids the warranty is my basic understanding of the issue. Sooner or later some way may be found around the chip, but in my opinion, the new Canon printer lineup is basically the old one except the added chip.
For those planning to use Canon OEM cartridges it makes very little difference, but those that want to use refilling or third party cartridges, it takes away a huge cost saving option. For example, I pay $1.39 cents for a cartridge Canon wants $12.00 for. And now Canon wants to charge you $2.25 extra per chip so now the $12.00 cartridge cost you $14.25.----and you get slightly less ink also.
And its not just the high an middle end printers. Canon has also chipped its low end printer inktanks also.
Hope that explains it some.-------see Steves Digicams for more detailed posts on the subject.