We just had a bomb dropped on us by an anonymous tipster, courtesy of a leaked version of the Google Wallet app - and it was hiding some pretty amazing secrets. Let's cut to the chase: physical Google Wallet card. That's happening, and you'll be able to get one, probably soon.
The physical Google Wallet card will work just like a regular credit card. Whatever your currently selected default card on the Wallet app is, the Wallet card will charge to. It will work anywhere major credit cards are accepted. This is for those scenarios where you don't have (or want to use) tap and pay.