We just received a "teaser" from AT&T for something on July 16. It states "Get ready for what's next in wireless, July 16."
Then there are quotes of speed, size and reviews of AT&T's LTE network, which led many to suggest some kind of network development such as LTE-Advanced. Some even suggest it will be Voice-over-LTE (VoLTE)
Others contend the teaser could be an event or news release.
You are welcome to post your ideas and suggestions, below in the comments.