What makes this interesting, is that a "proprietery scanner" is not needed, but any ubiquitous sensor can capture the id number. The contactless chip is a passive rfid.

Visa Contactless read by sensors
"Advances in standards and technology have Visa believing now's the time for the United States to embrace radio-frequency-enabled contactless payment devices that can be waved near a sensor rather than having to be swiped through a card reader. These devices can take the form of a standard credit or debit card, a chip implanted in a cell phone, or a mini card that's about half the size of a conventional credit card
The push to implement more convenient and secure forms of payment

Ed: We already know from previous articles that they will couple contactless payment with biometric id for authentication

.....  "moving to payment technologies that rely on microchips and radio-frequency sensors embedded on cards, key chains, or other devices,
Ed: like an rfid chip in the right hand or forehead
http://www.informationweek.com/security/showArticle.jhtml?articleID=183702491

"Blink" cards
http://www.informationweek.com/showArticle.jhtml;jsessionid=CR3MVIGTJR4NGQSNDBECKH0CJUMEKJVN?articleID=172900955