Looks like they've integrated a processor and keypad on the cards. Sounds like the problem you describe could be solved with an upgraded POS terminal, where the PIN is typed on the card, and transmitted thru the terminal[1] to the bank (with end-to-end encryption from the card to the bank).

[1] - Probably still need to rely on the terminal for the data transfer; smartphones aren't ubiquitous/convenient/permanently-data-connected enough. The card could either communicate with the POS terminal wirelessly through Bluetooth/NFC, or be attached face-up while entering the PIN code.