"stereoscopic filmmaking with cameras that were specially designed for the film's production"
"Unlike previous performance capture systems, where the digital environment is added after the actors' motions have been captured, Cameron's new virtual camera allows him to observe directly on a monitor how the actors' virtual counterparts interact with the movie's digital world in real time and adjust and direct the scenes just as if shooting live action"
"Besides a real time virtual world, the team is also experimenting with a way of letting computer generated characters interact with real actors on a real, live-action set while shooting live action"
Some kind of improvement...the way I see it -> Its going to be pretty interesting, captivating and creative movie.