Geode from iCache (2012)
kickstarter.com
kickstarter.com
Square/PayPal (also not the future with their current products) are not incompatible wit Coin. In fact, Coin fits well into the current ecosystem.
1. Get Paypal.
2. Verify Paypal Account.
3. Get Paypal Debit Card.
4. Setup several CCs in Paypal.
5. Maintain $0 balance in Paypal.
6. Setup backup source of funding for Debit Card.
7. Make an app that simply logs into Paypal to set the backup source of funding to another card at the touch of a button.
8. Get an NFC sticker and put it on the Paypal debit card.
This would allow you to carry 1 card but use any of your cards and, as well, help you keep track of your card's physical proximity with an NFC enabled device. Please let me know if I am grossly misunderstanding or missing something!
Switching cards was something like a 30 second process, which meant that instead of taking a card out, you had to open up the app, wait for it to load, wait an extra 10 seconds for it to connect to the Geode, then use the painfully-slow app. All to not carry a card in your wallet.
And on top of it - the two times I tried it at restaurants the card itself didn't work.
* has a new connector
* has a new form factor
* or, who the hell knows...
...that renders the Kickstarter project's goal irrelevant or unusable.
tl;dr: Quality(?) issues; then iPhone 5 with Passbook, new form factor, and lightning connector.
Wonder if there are any trademark implications of their name choice.