Forget about wallet. What really is needed is a good receipt/invoice management system. There aren't good apps out there I'm aware of. Receipts often need to be kept for warranty or tax auditing purposes. We need an app that can scan them, file them, adding up expenses, tagging categories, then linking to something like mint. Some apps can do the scan (take a photo really) but not the rest.
Wallet card is now available. http://www.androidcentral.com/google-wallet-card-now-avialable-order-ships-10-12-days
A more interesting variant that also includes credit card portability is a startup called coin. But that thing is still in development and faces other challenges. https://onlycoin.com/
