Unofficial rumblings have pointed to Isis Mobile Wallet's trial getting close. If you've remained skeptical all the same, we're pretty sure that seeing Isis' Android app in Google Play will change your mind. The currently T-Mobile-only software confirms that pilot program members will tie their American Express, Capital One or Chase card (as well as a unique card) to Isis for paying through NFC at stores with a SmartTap terminal. We're also promised streamlined loyalty cards and coupons. Before anyone rushes to try the app at the local shop, remember that it's just one piece of the puzzle on top of the special SIM card, one of three NFC-equipped phones and that small matter of living in Austin or Salt Lake City when the service goes live. Having the official app at least lets those who qualify get a head start on what could soon be the only major alternative to Google Wallet in the US.