AT&T has altered its terms of service to kill off any type of high bandwidth applications. In a nutshell the new TOS will not allow you to use your Slingbox, Skype, or watch Hulu using AT&T's mobile data services.
AT&T states "downloading movies using P2P file sharing services, customer initiated redirection of television or other video or audio signals via any technology from a fixed location to a mobile device, web broadcasting, and... any applications that tether the device... to Personal Computers or other equipment."
We will all have to wait and see how AT&T goes about enforcing these new rules. They could use Verizon's method where users are capped at 5 gigabytes and anything over that can get your service terminated. As the internet becomes more bandwidth heavy it's the networks that are inhibiting progress and not the technology.