News has just broke that AT&T has released a statement shedding some light on how they plan on going forwards with allowing FaceTime over their cellular network. Previously, speculation and rumors pointed to AT&T limiting users on enjoying FaceTime over 3G/4G, but as of today, AT&T is allowing its customers to FaceTime as they wish, but on one condition. You have to subscribe to their Mobile Share data plans.
Here's the official AT&T statement:
AT&T will offer FaceTime over Cellular as an added benefit of our new Mobile Share data plans, which were created to meet customers’ growing data needs at a great value. With Mobile Share, the more data you use, the more you save. FaceTime will continue to be available over Wi-Fi for all our customers.
As a side note, Sprint is offering FaceTime over their data network with no additional fees.