Square Enix recently shared that all six stages from the upcoming Final Fantasy 25th Anniversary event (to be broadcast at Nico Nico Live) will be live streamed. The event will take place from September 1st to September 2nd of the current year, and the general public is invited to attend the stages at the Shibuya event space. However, seats will be given to winners of a raffle. The main stage to keep an eye out for will be held on September 1st at 11:30 AM which is where Square Enix will reveal its plans for the Final Fantasy XIII series.
To recap, a listing of the full stage for the Final Fantasy XIII event can be viewed here.
Additional information regarding the live broadcast will be revealed at a later date.