Netcom, a Chinese company, reports that they are developing an NFC chips that goes on the microSD card. MicroSD is popular in many smartphones, tablet, and PCs as external storage unit. SanDisk is rumored to be developing a 128GB mircoSD card
What this means is that phones without an external NFC chip, they can plug in one of these NFC enabled microSD cards and it will syncs with the phone, allowing for the user to use NFC based apps like Google Wallet. Thats right, you do not have to buy a completely new phone to use Google Wallet.
That said, a few major deflects with an NFC integrated microSD card is 1) the wireless range is small so the phone has to be next to the reader to make any connection. 2) A driver or some background application must be running on the phone let the computer know that NFC is possible.