The report will look much like those provided by Silicon Valley companies. Here's what AT&T plans to offer, beginning in "early 2014":
1. The total number of law enforcement requests it receives from federal, state and local authorities
2. A breakdown of that figure by request type: subpoenas, court orders and warrants
3. The number of customers affected
4. "Details about the legal demands AT&T receives, as well as information about requests for information in emergencies."
Item #3 is especially important, because as I've explained before, it provides more perspective on the impact of the requests in a way that the overall number of requests can't by itself.
Now that two of the four big national wireless carriers have gotten on board, the question is whether T-Mobile and Sprint will follow suit. I've reached out to both companies and will update when I hear back.
Update: Sprint has declined to comment.
Another update: In an e-mailed response, T-Mobile tells me it's now "carefully considering additional transparency" in light of AT&T and Verizon's announcements.