The Alliance Tournament actually involves a deceptive amount of work to put on well, and when we decided to put the AT on hiatus it was because there was not enough manpower to put on a show up to the standards that the players and competitors had come to expect.
This past year CCP Aurora has been unearthing and updating the tech involved in the tournament, as well as putting together a plan to broadcast it year-after-year in a sustainable fashion. This is the culmination of months of work and preparation.