UPDATE: It seems that SlingMedia did, in fact, work with AT&T on getting this approved after all. Apparently while no code changes to the streaming portion of the application was changed due to AT&T’s requests, Sling did update it during continued development. AT&T later approved the application on their network for usage on iPhone devices.
That story has changed to reflect the OP. It now says they didn't. I have a tendency to believe Sling over AT&T who have been known to lie on many occasions.
