Although Google Wallet had some issues the other day and went down for a while it looks like there might have been a good reason for it. The app itself has just been updated and according to the change log there is improvements to the prepaid top up process but also support for "new device form factors".
The new form factor support entry is a rather interesting one, kind of makes you think there is more to this update then Google is ready to tell us right now. If you have a supported device, you should be seeing the update in the Google Play Store right now available for download.
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