RFID is a separate technology that uses MUCH lower frequencies (as low as 14Mhz) typically with a fully passive transponder that is RF powered. Rather than integrate the two (which I see happening also), the initial draft of the retail profile used ZigBee for that function. I think you will see them integrate.
The main reason for using ZigBee telecom profile over BT is power consumption. Phones, particularly large display units, have a challenge with battery life. BT is a power hog, although BTLE is better. My opinion is that ZigBee telecom may or may not see the light of day... but I am often wrong
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Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.