AT&T Unlimited Data User’s have had it good for a while now, But that’s really about to change, well that’s what the Rumor Is!!
Tat WZA

Rumor Is early October(same time as rumor iPhone 5 drop) AT&T will be throttling Data to it’s Customers, even the Unlimited one’s, all this as AT&T is gearing up for true 4G as well -_-
” The heaviest users will see significant speed decreases for one billing cycle once they go over a threshold of data (we’re guessing 2-4GB?). These heavy users will still be able to access the network, but at a much slower speed. At the start of the next billing cycle, their speeds will return to normal. ”
I can say throttling is Better than overcharges that have plagued plans since mobile started!!!

Oh Yeah, there has also been talk about an insurance plan restructure!