"This expanded investment is not expected to materially alter AT&T’s anticipated 2013 capital expenditures."
So, they've had the capability for a while now. They just didn't see any reason to bother with the hassle of deploying a newer technology when they could just keep maintaining U-verse over twisted pair, even if capex stayed the same for either choice. Which is an interesting choice.
As a non-American, I can only imagine the class-action lawsuits...
EDIT:
http://www.pbs.org/cringely/pulpit/2007/pulpit_20070810_0026...
For example: Valve, Google and Facebook all try to be "good," since their target audience are often young, technology-oriented people who care about how good the company is.
But for some corporations, it doesn't matter what their users think. Majority of AT&T customers are average people, who know nothing about ISPs and slow Internet. They just want their "Skype-box" to work.