By restricting FaceTime over cellular to its LTE customers, AT&T cuts out customers on the iPhone 4 and 4S, who likely make up a larger percentage of its iPhone subscribers. The carrier did say, however, that it would monitor the effect of the feature, and will likely be able to offer the feature to "customers on other billing plans in the near future."
In its post, AT&T also said that as of October 26 it will roll out billing plans for deaf and hard of hearing customers to allow them to use FaceTime over cellular as well, but it didn't offer any specific details on those plans.
