Great headline. Brian X. Chen for NY Times:
Customers with unlimited plans will get to keep their unlimited plans. But when shared data plans become available, the unlimited option will no longer be available to customers when they buy a new device at a subsidized price, usually with a two-year service contract.
Basically 95% of people who buy an iPhone 5 soon. What me is that AT&T already hates the idea of unlimited plans, so you can expect to see other carriers follow suit.