Let me start this off by saying, no this is not Jelly Bean. Now that's out of the way, US Cellular has pushed out an OTA to update their Samsung Galaxy S3 to build R530UVXLI4. So far US Cellular hasn't said much about this update yet, it does look like Google Wallet will now be supported on their Samsung Galaxy S3.
Prior to this update, the only carrier to support Google Wallet on any NFC-supported device has been Sprint. It has been their selling point on a few devices including the Nexus S 4G, and Galaxy Nexus. You can update your US Cellular Samsung Galaxy S3 two different ways. You can download the .exe file from their site which is about 756MB or you can get the OTA by going into Settings, selecting About device and check for updates.
Any US Cellular customers get this update yet? Hit up the comments and let us know what kind of changes you see.