'Avatar 4' Production Has Begun, According to James Cameron

At the D23 Expo, James Cameron officially confirmed  

that production on Avatar 4 had begun. 

 Cameron virtually joined the Expo from New Zealand.

To provide updated information on all of 

the forthcoming Avatar sequels.While providing  

 an update on Avatar 4, Cameron also informed.

Expo attendees that filming on Avatar 3 was still  

"I'm super excited to be finally putting the finishing touches on