Currently, the service works only for PayPass enabled Citi MasterCards and the app can be downloaded only on the Google Nexus S 4G, running on Android 2.3.4 and branded with the Sprint name. Google would love to expand the application to other cards besides the Citi MasterCard. and phones besides Sprint's Google Nexus S 4G. Also, retail outlets need to be outfitted with the PayPass Station.
Just because the Google Wallet app appears ready to launch on Monday, don't expect to be using this service immediately. The number of stores that will be ready to accept Google Wallet will hopefully increase sharply in time for the launch of the Mountain View based firm's next flagship device, the Samsung Galaxy Prime aka Samsung Galaxy Nexus aka DROID Prime which will also support NFC and as a result, Google Wallet. As we told you yesterday, that phone is rumored to be launching November 3rd.
Another good reason to suspect the launch of the service tomorrow is that Monday also brings the opening of the NFC World Congress in the French Riviera.