RFID Gen 2 is the latest generation of RFID [Radio Frequency IDentification] tags, an evolution of Electronic Product Codes [EPC] specified by EPCglobal Inc.
The security of Gen 2 is way lighter than smart card security, as circuits are not necessarily protected, protocols are not based on strong cryptography, and access is based on passwords. Anyway, there is a security layer in Gen 2, however weak, that can be improved on in future generation. An obvious way to do it would be to import specifications and practices from the smart card world, at which point RFID would possibly become a disruptive technology to smart cards, in the sense intended by Clay Christensen in The Innovator's Dilemma. I.e. RFID comes from a low price point, with inferior capabilities, but may climb up the value chain below the smart cards one.