Another discussion: https://news.ycombinator.com/item?id=6770398

From the top of the other thread:

"Let's clarify some things here, before the comment threads take off too much:

- This is a prepaid card. It does not proxy other cards, unlike previous rumored versions of a Wallet card.

- It only draws from Wallet balance. Funds can be added to wallet balance via various means (bank account [free], receiving a GMail P2P payment [free], credit cards [2.9% fee]), but this does not happen automatically.

As such, it does not appear to be trying to achieve the same "card replacement" that e.g. Coin is. No, it is simply providing another way to get at Wallet balance that doesn't involve transfer to a bank account or NFC payment. Could be useful for people who make use of GMail P2P payments."