AllThingsD has confirmed our suspicion that it was a software glitch that allowed iPhone upgraders to keep their unlimited data plans.
There is, however, good news for those lucky enough to have upgraded their phones before the glitch was caught:
[Verizon] said it would honor the unlimited plans of those customers who managed to upgrade while Verizon was working to fix its software.
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Nice of Verizon to honor, but not allowing up graders to keep is just a sign of how Verizon is becoming less customer friendly as I know of AT&T customers with unlimited data who are upgrading to new iPhones and have been able to retain their unlimited data plans.